204:
36:
292:
modules' CAS latencies are specified in clock ticks instead of time, when comparing latencies at different clock speeds, latencies must be translated into absolute times to make a fair comparison; a higher numerical CAS latency may still be less time if the clock is faster. Likewise, a memory module
307:
performs two transfers per clock cycle, and it is usually described by this transfer rate. Because the CAS latency is specified in clock cycles, and not transfers (which occur on both the rising and falling edges of the clock), it is important to ensure it is the clock rate (half of the transfer
315:
size of 64 bytes, requiring eight transfers from a 64-bit-wide (eight bytes) memory to fill. The CAS latency can only accurately measure the time to transfer the first word of memory; the time to transfer all eight words depends on the data transfer rate as well. Fortunately, the processor
190:, each of which composes a separate DRAM array. Each bank contains 2=16384 rows of 2=8192 bits each. One byte of memory (from each chip; 64 bits total from the whole DIMM) is accessed by supplying a 3-bit bank number, a 14-bit row address, and a 13-bit column address.
280:
can occur, resulting in a loss of bandwidth. For a completely unknown memory access (AKA Random access), the relevant latency is the time to close any open row, plus the time to open the desired row, followed by the CAS latency to read data from it. Due to
152:
When no word line is active, the array is idle and the bit lines are held in a precharged state, with a voltage halfway between high and low. This indeterminate signal is deflected towards high or low by the storage capacitor when a row is made active.
275:
is determined solely by the clock speed. Unfortunately, this maximum bandwidth can only be attained if the address of the data to be read is known long enough in advance; if the address of the data being accessed is not predictable,
167:
signal are presented to the memory module and the time at which the corresponding data is made available by the memory module. The desired row must already be active; if it is not, additional time is required.
267:
Because memory modules have multiple internal banks, and data can be output from one during access latency for another, the output pins can be kept 100% busy regardless of the CAS latency through
145:
that amplifies the small voltage change produced by the storage capacitor. This amplified signal is then output from the DRAM chip as well as driven back up the bit line to
256:
With asynchronous DRAM, memory was accessed by a memory controller on the memory bus based on a set timing rather than a clock, and was separate from the system bus.
3476:
111:, the interval is specified in clock cycles. Because the latency is dependent upon a number of clock ticks instead of absolute time, the actual time for an
3608:
3574:
3566:
285:, however, it is common to access several words in the same row. In this case, the CAS latency alone determines the elapsed time.
108:
3544:
3593:
243:
79:
61:
225:
46:
3416:
Command rate = Data rate / 2 for double data rate (DDR), Command rate = Data rate for single data rate (SDR).
3480:
221:
104:
103:, is the delay in clock cycles between the READ command and the moment data is available. In asynchronous
3517:
17:
260:, however, has a CAS latency that is dependent upon the clock rate. Accordingly, the CAS latency of an
156:
To access memory, a row must first be selected and loaded into the sense amplifiers. This row is then
115:
module to respond to a CAS event might vary between uses of the same module if the clock rate differs.
3495:
3625:
311:
Another complicating factor is the use of burst transfers. A modern microprocessor might have a
214:
57:
282:
272:
3601:
3586:
268:
8:
3610:
AnandTech: Everything You Always Wanted To Know About SDRAM Memory But Were Afraid To Ask
327:—per second (MT/s), while clock rates are given in MHz, million cycles per second.
3579:
297:
could have its CAS latency cycle count reduced to preserve the same CAS latency time.
129:
Dynamic RAM is arranged in a rectangular array. Each row is selected by a horizontal
3540:
137:
present in that row, connecting each storage capacitor to its corresponding vertical
53:
3567:
User-entered Memory Timing
Comparisons and Memory timing examples (CAS latency only)
300:
124:
323:
In the table below, data rates are given in million transfers—also known as
320:
order, and the first critical word can be used by the microprocessor immediately.
316:
typically does not need to wait for all eight words; the burst is usually sent in
163:
The CAS latency is the delay between the time at which the column address and the
3534:
27:
Time delay between data read command and availability of data in a computer's RAM
3455:
277:
3619:
3533:
Keeth, Brent; Baker, R. Jacob; Johnson, Brian; Lin, Feng (December 4, 2007).
186:
of storage space. Each chip is divided internally into eight banks of 2=128
3497:
Synchronous DRAM Architectures, Organizations, and
Alternative Technologies
324:
294:
2871:
1651:
817:
527:
312:
228: in this section. Unsourced material may be challenged and removed.
3519:
Memory technology evolution: an overview of system memory technologies
436:
264:
memory module is specified in clock ticks instead of absolute time.
203:
64:. Statements consisting only of original research should be removed.
3477:"Ars Technica RAM Guide Part II: Asynchronous and Synchronous DRAM"
183:
172:
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107:, the interval is specified in nanoseconds (absolute time). In
134:
133:. Sending a logical high signal along a given row enables the
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112:
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304:
308:
rate) which is being used to compute CAS latency times.
3536:
DRAM Circuit Design: Fundamental and High-Speed Topics
3532:
3425:Cycle time = 1 / Command rate = 2 × Transfer time.
367:
364:
361:
355:
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349:
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3617:
193:
178:memory module might contain eight separate one-
160:and columns may be accessed for read or write.
3581:PCSTATS: Memory Bandwidth vs. Latency Timings
3575:DDR4 RAM Actual Timings Full Comparison Grid
3474:
118:
336:Memory timing examples (CAS latency only)
3435:
3433:
3431:
330:
244:Learn how and when to remove this message
80:Learn how and when to remove this message
3596:Tight Timings vs High Clock Frequencies
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3494:Jacob, Bruce L. (December 10, 2002),
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3507:
3475:Stokes, Jon "Hannibal" (1998–2004).
226:adding citations to reliable sources
197:
29:
141:. Each bit line is connected to a
125:DRAM § Principles of operation
24:
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25:
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202:
34:
213:needs additional citations for
3526:
3479:. Ars Technica. Archived from
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3407:Transfer time = 1 / Data rate.
3401:
182:DRAM chips, each offering 128
13:
1:
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194:Effect on memory access speed
93:Column address strobe latency
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171:As an example, a typical 1
60:the claims made and adding
10:
3642:
122:
3603:Understanding RAM Timings
3539:. John Wiley & Sons.
3387:
3384:
3381:
3378:
3375:
3372:
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3363:
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3246:
3189:
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2727:
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2112:
2041:
1970:
1885:
1828:
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1714:
1657:
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1563:
1534:
1505:
1448:
1377:
1348:
1263:
1234:
1135:
1106:
1049:
950:
921:
850:
821:
731:
660:
617:
574:
531:
469:
440:
358:
343:
340:
271:; the maximum attainable
3503:, University of Maryland
3394:
119:RAM operation background
3588:How Memory Access Works
3594:Tom's Hardware Guide:
331:Memory timing examples
165:column address strobe
123:Further information:
222:improve this article
337:
318:critical word first
335:
45:possibly contains
3392:
3391:
254:
253:
246:
90:
89:
82:
47:original research
16:(Redirected from
3633:
3551:
3550:
3530:
3524:
3523:
3514:
3505:
3504:
3502:
3491:
3485:
3484:
3472:
3443:
3437:
3426:
3423:
3417:
3414:
3408:
3405:
338:
334:
301:Double data rate
283:spatial locality
258:Synchronous DRAM
249:
242:
238:
235:
229:
206:
198:
109:synchronous DRAM
85:
78:
74:
71:
65:
62:inline citations
38:
37:
30:
21:
3641:
3640:
3636:
3635:
3634:
3632:
3631:
3630:
3626:Computer memory
3616:
3615:
3560:
3555:
3554:
3547:
3531:
3527:
3522:, HP, July 2008
3516:
3515:
3508:
3500:
3492:
3488:
3473:
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3452:
3447:
3446:
3438:
3429:
3424:
3420:
3415:
3411:
3406:
3402:
3397:
3335:6600 MT/s
3250:6400 MT/s
3193:6200 MT/s
3108:6000 MT/s
3023:5600 MT/s
2952:5200 MT/s
2881:4800 MT/s
2831:4800 MT/s
2788:4600 MT/s
2731:4400 MT/s
2660:4266 MT/s
2631:4200 MT/s
2602:4133 MT/s
2531:4000 MT/s
2502:3866 MT/s
2473:3733 MT/s
2374:3600 MT/s
2331:3533 MT/s
2274:3466 MT/s
2231:3400 MT/s
2202:3333 MT/s
2173:3300 MT/s
2116:3200 MT/s
2045:3000 MT/s
1974:2800 MT/s
1889:2666 MT/s
1832:2400 MT/s
1775:2133 MT/s
1718:1866 MT/s
1661:1600 MT/s
1625:3300 MT/s
1596:3200 MT/s
1567:3100 MT/s
1538:3000 MT/s
1509:2933 MT/s
1452:2800 MT/s
1381:2666 MT/s
1352:2600 MT/s
1267:2400 MT/s
1238:2200 MT/s
1139:2133 MT/s
1110:2000 MT/s
1053:1866 MT/s
954:1600 MT/s
925:1375 MT/s
854:1333 MT/s
825:1066 MT/s
735:1066 MT/s
333:
288:Because modern
278:pipeline stalls
250:
239:
233:
230:
219:
207:
196:
143:sense amplifier
127:
121:
86:
75:
69:
66:
51:
39:
35:
28:
23:
22:
15:
12:
11:
5:
3639:
3629:
3628:
3614:
3613:
3606:
3599:
3591:
3584:
3577:
3569:
3559:
3558:External links
3556:
3553:
3552:
3546:978-0470184752
3545:
3525:
3506:
3486:
3483:on 2012-11-01.
3466:
3465:
3463:
3460:
3459:
3458:
3456:Memory timings
3451:
3448:
3445:
3444:
3427:
3418:
3409:
3399:
3398:
3396:
3393:
3390:
3389:
3386:
3383:
3380:
3377:
3374:
3371:
3370:Transfer time
3368:
3365:
3362:
3358:
3357:
3356:11.36 ns
3354:
3353:10.76 ns
3351:
3350:10.30 ns
3348:
3345:
3344:0.303 ns
3342:
3341:3300 MHz
3339:
3338:0.152 ns
3336:
3333:
3329:
3328:
3327:11.09 ns
3325:
3324:10.47 ns
3322:
3321:10.00 ns
3319:
3315:
3314:
3313:11.72 ns
3311:
3310:11.09 ns
3308:
3307:10.63 ns
3305:
3301:
3300:
3299:12.34 ns
3297:
3296:11.72 ns
3294:
3293:11.25 ns
3291:
3287:
3286:
3285:12.97 ns
3283:
3282:12.34 ns
3280:
3279:11.88 ns
3277:
3273:
3272:
3271:13.59 ns
3269:
3268:12.97 ns
3266:
3265:12.50 ns
3263:
3260:
3259:0.313 ns
3257:
3256:3200 MHz
3254:
3253:0.156 ns
3251:
3248:
3244:
3243:
3242:12.74 ns
3240:
3239:12.10 ns
3237:
3236:11.61 ns
3234:
3230:
3229:
3228:13.39 ns
3226:
3225:12.74 ns
3223:
3222:12.26 ns
3220:
3216:
3215:
3214:14.03 ns
3212:
3211:13.39 ns
3209:
3208:12.90 ns
3206:
3203:
3202:0.323 ns
3200:
3199:3100 MHz
3197:
3196:0.161 ns
3194:
3191:
3187:
3186:
3185:11.17 ns
3183:
3182:10.50 ns
3180:
3179:10.00 ns
3177:
3173:
3172:
3171:11.83 ns
3169:
3168:11.17 ns
3166:
3165:10.67 ns
3163:
3159:
3158:
3157:13.17 ns
3155:
3154:12.50 ns
3152:
3151:12.00 ns
3149:
3145:
3144:
3143:13.83 ns
3141:
3140:13.17 ns
3138:
3137:12.67 ns
3135:
3131:
3130:
3129:14.50 ns
3127:
3126:13.83 ns
3124:
3123:13.33 ns
3121:
3118:
3117:0.333 ns
3115:
3114:3000 MHz
3112:
3111:0.167 ns
3109:
3106:
3102:
3101:
3100:11.96 ns
3098:
3097:11.25 ns
3095:
3094:10.71 ns
3092:
3088:
3087:
3086:13.39 ns
3084:
3083:12.68 ns
3081:
3080:12.14 ns
3078:
3074:
3073:
3072:14.11 ns
3070:
3069:13.39 ns
3067:
3066:12.86 ns
3064:
3060:
3059:
3058:14.82 ns
3056:
3055:14.11 ns
3053:
3052:13.57 ns
3050:
3046:
3045:
3044:15.54 ns
3042:
3041:14.82 ns
3039:
3038:14.29 ns
3036:
3033:
3032:0.357 ns
3030:
3029:2800 MHz
3027:
3026:0.179 ns
3024:
3021:
3017:
3016:
3015:14.42 ns
3013:
3012:13.65 ns
3010:
3009:13.08 ns
3007:
3003:
3002:
3001:15.19 ns
2999:
2998:14.42 ns
2996:
2995:13.85 ns
2993:
2989:
2988:
2987:15.96 ns
2985:
2984:15.19 ns
2982:
2981:14.62 ns
2979:
2975:
2974:
2973:16.73 ns
2971:
2970:15.96 ns
2968:
2967:15.38 ns
2965:
2962:
2961:0.385 ns
2959:
2958:2600 MHz
2956:
2955:0.192 ns
2953:
2950:
2946:
2945:
2944:15.63 ns
2942:
2941:14.79 ns
2939:
2938:14.17 ns
2936:
2932:
2931:
2930:16.46 ns
2928:
2927:15.63 ns
2925:
2924:15.00 ns
2922:
2918:
2917:
2916:17.29 ns
2914:
2913:16.46 ns
2911:
2910:15.83 ns
2908:
2904:
2903:
2902:18.13 ns
2900:
2899:17.29 ns
2897:
2896:16.67 ns
2894:
2891:
2890:0.417 ns
2888:
2887:2400 MHz
2885:
2884:0.208 ns
2882:
2879:
2875:
2874:
2868:
2867:
2864:
2861:
2858:
2854:
2853:
2850:
2847:
2844:
2841:
2840:0.417 ns
2838:
2837:2400 MHz
2835:
2834:0.208 ns
2832:
2829:
2825:
2824:
2821:
2818:
2815:
2811:
2810:
2807:
2804:
2801:
2798:
2797:0.435 ns
2795:
2794:2300 MHz
2792:
2791:0.217 ns
2789:
2786:
2782:
2781:
2778:
2775:
2772:
2768:
2767:
2764:
2761:
2758:
2754:
2753:
2752:10.23 ns
2750:
2747:
2744:
2741:
2740:0.454 ns
2738:
2737:2200 MHz
2735:
2734:0.227 ns
2732:
2729:
2725:
2724:
2721:
2718:
2715:
2711:
2710:
2707:
2704:
2701:
2697:
2696:
2695:10.08 ns
2693:
2690:
2687:
2683:
2682:
2681:10.55 ns
2679:
2676:
2673:
2670:
2669:0.469 ns
2667:
2666:2133 MHz
2664:
2663:0.234 ns
2661:
2658:
2654:
2653:
2652:10.71 ns
2650:
2647:
2644:
2641:
2640:0.476 ns
2638:
2637:2100 MHz
2635:
2634:0.238 ns
2632:
2629:
2625:
2624:
2623:10.89 ns
2621:
2618:
2615:
2612:
2611:0.484 ns
2609:
2608:2066 MHz
2606:
2605:0.242 ns
2603:
2600:
2596:
2595:
2592:
2589:
2586:
2582:
2581:
2580:10.25 ns
2578:
2575:
2572:
2568:
2567:
2566:10.75 ns
2564:
2561:
2558:
2554:
2553:
2552:11.25 ns
2550:
2549:10.25 ns
2547:
2544:
2541:
2540:0.500 ns
2538:
2537:2000 MHz
2535:
2534:0.250 ns
2532:
2529:
2525:
2524:
2523:11.12 ns
2521:
2520:10.09 ns
2518:
2515:
2512:
2511:0.517 ns
2509:
2508:1933 MHz
2506:
2505:0.259 ns
2503:
2500:
2496:
2495:
2494:10.98 ns
2492:
2489:
2486:
2483:
2482:0.536 ns
2480:
2479:1866 MHz
2477:
2476:0.268 ns
2474:
2471:
2467:
2466:
2463:
2460:
2457:
2453:
2452:
2451:10.28 ns
2449:
2446:
2443:
2439:
2438:
2437:10.83 ns
2435:
2432:
2429:
2425:
2424:
2423:11.39 ns
2421:
2420:10.28 ns
2418:
2415:
2411:
2410:
2409:11.94 ns
2407:
2406:10.83 ns
2404:
2403:10.00 ns
2401:
2397:
2396:
2395:12.50 ns
2393:
2392:11.39 ns
2390:
2389:10.56 ns
2387:
2384:
2383:0.556 ns
2381:
2380:1800 MHz
2378:
2377:0.278 ns
2375:
2372:
2368:
2367:
2366:10.47 ns
2364:
2361:
2358:
2354:
2353:
2352:11.04 ns
2350:
2347:
2344:
2341:
2340:0.566 ns
2338:
2337:1766 MHz
2335:
2334:0.283 ns
2332:
2329:
2325:
2324:
2323:11.25 ns
2321:
2320:10.10 ns
2318:
2315:
2311:
2310:
2309:11.83 ns
2307:
2306:10.67 ns
2304:
2301:
2297:
2296:
2295:12.40 ns
2293:
2292:11.25 ns
2290:
2289:10.38 ns
2287:
2284:
2283:0.577 ns
2281:
2280:1733 MHz
2278:
2277:0.288 ns
2275:
2272:
2268:
2267:
2266:10.29 ns
2264:
2261:
2258:
2254:
2253:
2252:11.47 ns
2250:
2249:10.29 ns
2247:
2244:
2241:
2240:0.588 ns
2238:
2237:1700 MHz
2235:
2234:0.294 ns
2232:
2229:
2225:
2224:
2223:11.70 ns
2221:
2220:10.50 ns
2218:
2215:
2212:
2211:0.600 ns
2209:
2208:1666 MHz
2206:
2205:0.300 ns
2203:
2200:
2196:
2195:
2194:11.82 ns
2192:
2191:10.61 ns
2189:
2186:
2183:
2182:0.606 ns
2180:
2179:1650 MHz
2177:
2176:0.303 ns
2174:
2171:
2167:
2166:
2165:10.94 ns
2163:
2160:
2157:
2153:
2152:
2151:11.56 ns
2149:
2148:10.31 ns
2146:
2143:
2139:
2138:
2137:12.19 ns
2135:
2134:10.94 ns
2132:
2131:10.00 ns
2129:
2126:
2125:0.625 ns
2123:
2122:1600 MHz
2120:
2119:0.313 ns
2117:
2114:
2110:
2109:
2108:11.67 ns
2106:
2105:10.33 ns
2103:
2100:
2096:
2095:
2094:12.33 ns
2092:
2091:11.00 ns
2089:
2088:10.00 ns
2086:
2082:
2081:
2080:13.00 ns
2078:
2077:11.67 ns
2075:
2074:10.67 ns
2072:
2068:
2067:
2066:13.67 ns
2064:
2063:12.33 ns
2061:
2060:11.33 ns
2058:
2055:
2054:0.667 ns
2052:
2051:1500 MHz
2049:
2048:0.333 ns
2046:
2043:
2039:
2038:
2037:12.50 ns
2035:
2034:11.07 ns
2032:
2031:10.00 ns
2029:
2025:
2024:
2023:13.21 ns
2021:
2020:11.79 ns
2018:
2017:10.71 ns
2015:
2011:
2010:
2009:13.93 ns
2007:
2006:12.50 ns
2004:
2003:11.43 ns
2001:
1997:
1996:
1995:14.64 ns
1993:
1992:13.21 ns
1990:
1989:12.14 ns
1987:
1984:
1983:0.714 ns
1981:
1980:1400 MHz
1978:
1977:0.357 ns
1975:
1972:
1968:
1967:
1966:12.38 ns
1964:
1963:10.88 ns
1961:
1958:
1954:
1953:
1952:13.88 ns
1950:
1949:12.38 ns
1947:
1946:11.25 ns
1944:
1940:
1939:
1938:14.63 ns
1936:
1935:13.13 ns
1933:
1932:12.00 ns
1930:
1926:
1925:
1924:15.38 ns
1922:
1921:13.88 ns
1919:
1918:12.75 ns
1916:
1912:
1911:
1910:16.88 ns
1908:
1907:15.38 ns
1905:
1904:14.25 ns
1902:
1899:
1898:0.750 ns
1896:
1895:1333 MHz
1893:
1892:0.375 ns
1890:
1887:
1883:
1882:
1881:15.42 ns
1879:
1878:13.75 ns
1876:
1875:12.50 ns
1873:
1869:
1868:
1867:16.25 ns
1865:
1864:14.58 ns
1862:
1861:13.33 ns
1859:
1855:
1854:
1853:17.08 ns
1851:
1850:15.42 ns
1848:
1847:14.17 ns
1845:
1842:
1841:0.833 ns
1839:
1838:1200 MHz
1836:
1835:0.417 ns
1833:
1830:
1826:
1825:
1824:16.41 ns
1822:
1821:14.53 ns
1819:
1818:13.13 ns
1816:
1812:
1811:
1810:17.34 ns
1808:
1807:15.47 ns
1805:
1804:14.06 ns
1802:
1798:
1797:
1796:18.28 ns
1794:
1793:16.41 ns
1791:
1790:15.00 ns
1788:
1785:
1784:0.938 ns
1782:
1781:1066 MHz
1779:
1778:0.469 ns
1776:
1773:
1769:
1768:
1767:16.61 ns
1765:
1764:14.46 ns
1762:
1761:12.86 ns
1759:
1755:
1754:
1753:17.68 ns
1751:
1750:15.54 ns
1748:
1747:13.93 ns
1745:
1741:
1740:
1739:18.75 ns
1737:
1736:16.61 ns
1734:
1733:15.00 ns
1731:
1728:
1727:1.071 ns
1725:
1722:
1721:0.536 ns
1719:
1716:
1712:
1711:
1710:16.88 ns
1708:
1707:14.38 ns
1705:
1704:12.50 ns
1702:
1698:
1697:
1696:18.13 ns
1694:
1693:15.63 ns
1691:
1690:13.75 ns
1688:
1684:
1683:
1682:19.38 ns
1680:
1679:16.88 ns
1677:
1676:15.00 ns
1674:
1671:
1670:1.250 ns
1668:
1665:
1664:0.625 ns
1662:
1659:
1655:
1654:
1648:
1647:
1646:11.82 ns
1644:
1643:10.61 ns
1641:
1638:
1635:
1634:0.606 ns
1632:
1631:1650 MHz
1629:
1628:0.303 ns
1626:
1623:
1619:
1618:
1617:12.19 ns
1615:
1614:10.94 ns
1612:
1611:10.00 ns
1609:
1606:
1605:0.625 ns
1603:
1602:1600 MHz
1600:
1599:0.313 ns
1597:
1594:
1590:
1589:
1588:10.00 ns
1586:
1583:
1580:
1577:
1576:0.645 ns
1574:
1573:1550 MHz
1571:
1570:0.323 ns
1568:
1565:
1561:
1560:
1559:10.33 ns
1557:
1554:
1551:
1548:
1547:0.667 ns
1545:
1544:1500 MHz
1542:
1541:0.333 ns
1539:
1536:
1532:
1531:
1530:10.57 ns
1528:
1525:
1522:
1519:
1518:0.682 ns
1516:
1515:1466 MHz
1513:
1512:0.341 ns
1510:
1507:
1503:
1502:
1501:10.36 ns
1499:
1496:
1493:
1489:
1488:
1487:11.07 ns
1485:
1482:
1479:
1475:
1474:
1473:13.93 ns
1471:
1470:12.50 ns
1468:
1467:11.43 ns
1465:
1462:
1461:0.714 ns
1459:
1458:1400 MHz
1456:
1455:0.357 ns
1453:
1450:
1446:
1445:
1444:10.88 ns
1442:
1439:
1436:
1432:
1431:
1430:11.63 ns
1428:
1427:10.13 ns
1425:
1422:
1418:
1417:
1416:12.38 ns
1414:
1413:10.88 ns
1411:
1408:
1404:
1403:
1402:13.88 ns
1400:
1399:12.38 ns
1397:
1396:11.25 ns
1394:
1391:
1390:0.750 ns
1388:
1387:1333 MHz
1385:
1384:0.375 ns
1382:
1379:
1375:
1374:
1373:11.15 ns
1371:
1368:
1365:
1362:
1361:0.769 ns
1359:
1358:1300 MHz
1356:
1355:0.385 ns
1353:
1350:
1346:
1345:
1344:10.42 ns
1342:
1339:
1336:
1332:
1331:
1330:11.25 ns
1328:
1325:
1322:
1318:
1317:
1316:12.08 ns
1314:
1313:10.42 ns
1311:
1308:
1304:
1303:
1302:12.92 ns
1300:
1299:11.25 ns
1297:
1296:10.00 ns
1294:
1290:
1289:
1288:13.75 ns
1286:
1285:12.08 ns
1283:
1282:10.83 ns
1280:
1277:
1276:0.833 ns
1274:
1273:1200 MHz
1271:
1270:0.417 ns
1268:
1265:
1261:
1260:
1257:
1254:
1251:
1248:
1247:0.909 ns
1245:
1244:1100 MHz
1242:
1241:0.455 ns
1239:
1236:
1232:
1231:
1228:
1225:
1222:
1218:
1217:
1216:10.78 ns
1214:
1211:
1208:
1204:
1203:
1202:11.72 ns
1200:
1197:
1194:
1190:
1189:
1188:12.66 ns
1186:
1185:10.78 ns
1183:
1180:
1176:
1175:
1174:13.59 ns
1172:
1171:11.72 ns
1169:
1168:10.31 ns
1166:
1162:
1161:
1160:14.53 ns
1158:
1157:12.66 ns
1155:
1154:11.25 ns
1152:
1149:
1148:0.938 ns
1146:
1145:1066 MHz
1143:
1142:0.469 ns
1140:
1137:
1133:
1132:
1131:12.50 ns
1129:
1128:10.50 ns
1126:
1123:
1120:
1119:1.000 ns
1117:
1116:1000 MHz
1114:
1113:0.500 ns
1111:
1108:
1104:
1103:
1102:12.32 ns
1100:
1099:10.18 ns
1097:
1094:
1090:
1089:
1088:13.39 ns
1086:
1085:11.25 ns
1083:
1080:
1076:
1075:
1074:14.46 ns
1072:
1071:12.32 ns
1069:
1068:10.71 ns
1066:
1063:
1062:1.071 ns
1060:
1057:
1056:0.536 ns
1054:
1051:
1047:
1046:
1045:11.88 ns
1043:
1040:
1037:
1033:
1032:
1031:13.13 ns
1029:
1028:10.63 ns
1026:
1023:
1019:
1018:
1017:14.38 ns
1015:
1014:11.88 ns
1012:
1011:10.00 ns
1009:
1005:
1004:
1003:15.63 ns
1001:
1000:13.13 ns
998:
997:11.25 ns
995:
991:
990:
989:16.88 ns
987:
986:14.38 ns
984:
983:12.50 ns
981:
977:
976:
975:18.13 ns
973:
972:15.63 ns
970:
969:13.75 ns
967:
964:
963:1.250 ns
961:
958:
957:0.625 ns
955:
952:
948:
947:
946:12.36 ns
944:
941:
938:
935:
934:1.455 ns
932:
929:
928:0.727 ns
926:
923:
919:
918:
917:14.25 ns
915:
914:11.25 ns
912:
909:
905:
904:
903:15.75 ns
901:
900:12.75 ns
898:
897:10.50 ns
895:
891:
890:
889:17.25 ns
887:
886:14.25 ns
884:
883:12.00 ns
881:
877:
876:
875:18.75 ns
873:
872:15.75 ns
870:
869:13.50 ns
867:
864:
863:1.500 ns
861:
858:
857:0.750 ns
855:
852:
848:
847:
846:19.69 ns
844:
843:15.94 ns
841:
840:13.13 ns
838:
835:
834:1.875 ns
832:
829:
828:0.938 ns
826:
823:
820:
814:
813:
812:14.06 ns
810:
809:10.31 ns
807:
804:
800:
799:
798:15.00 ns
796:
795:11.25 ns
793:
790:
786:
785:
784:15.94 ns
782:
781:12.19 ns
779:
776:
772:
771:
770:17.81 ns
768:
767:14.06 ns
765:
764:11.25 ns
762:
758:
757:
756:19.69 ns
754:
753:15.94 ns
751:
750:13.13 ns
748:
745:
744:1.875 ns
742:
739:
738:0.938 ns
736:
733:
729:
728:
727:18.75 ns
725:
724:13.75 ns
722:
721:10.00 ns
719:
715:
714:
713:20.00 ns
711:
710:15.00 ns
708:
707:11.25 ns
705:
701:
700:
699:21.25 ns
697:
696:16.25 ns
694:
693:12.50 ns
691:
687:
686:
685:23.75 ns
683:
682:18.75 ns
680:
679:15.00 ns
677:
674:
673:2.500 ns
671:
668:
667:1.250 ns
665:
664:800 MT/s
662:
658:
657:
656:22.50 ns
654:
653:16.50 ns
651:
650:12.00 ns
648:
644:
643:
642:25.50 ns
640:
639:19.50 ns
637:
636:15.00 ns
634:
631:
630:3.000 ns
628:
625:
624:1.500 ns
622:
621:667 MT/s
619:
615:
614:
613:24.38 ns
611:
610:16.88 ns
608:
607:11.25 ns
605:
601:
600:
599:28.13 ns
597:
596:20.63 ns
594:
593:15.00 ns
591:
588:
587:3.750 ns
585:
582:
581:1.875 ns
579:
578:533 MT/s
576:
572:
571:
570:32.50 ns
568:
567:22.50 ns
565:
564:15.00 ns
562:
558:
557:
556:37.50 ns
554:
553:27.50 ns
551:
550:20.00 ns
548:
545:
544:5.000 ns
542:
539:
538:2.500 ns
536:
535:400 MT/s
533:
530:
524:
523:
522:27.50 ns
520:
519:17.50 ns
517:
516:10.00 ns
514:
510:
509:
508:30.00 ns
506:
505:20.00 ns
503:
502:12.50 ns
500:
496:
495:
494:32.50 ns
492:
491:22.50 ns
489:
488:15.00 ns
486:
483:
482:5.000 ns
480:
477:
476:2.500 ns
474:
473:400 MT/s
471:
467:
466:
465:36.00 ns
463:
462:24.00 ns
460:
459:15.00 ns
457:
454:
453:6.000 ns
451:
448:
447:3.000 ns
445:
444:333 MT/s
442:
439:
433:
432:
429:
426:
423:
420:
417:
414:
411:
408:
404:
403:
400:
397:
394:
391:
388:
385:
382:
379:
376:
370:
369:
366:
363:
360:
357:
354:
351:
350:Transfer time
348:
345:
342:
332:
329:
252:
251:
234:September 2020
210:
208:
201:
195:
192:
120:
117:
95:, also called
88:
87:
42:
40:
33:
26:
9:
6:
4:
3:
2:
3638:
3627:
3624:
3623:
3621:
3612:
3611:
3607:
3605:
3604:
3600:
3598:
3597:
3592:
3590:
3589:
3585:
3583:
3582:
3578:
3576:
3573:
3572:Google Sheet:
3570:
3568:
3565:
3564:Google Sheet:
3562:
3561:
3548:
3542:
3538:
3537:
3529:
3521:
3520:
3513:
3511:
3499:
3498:
3490:
3482:
3478:
3471:
3467:
3457:
3454:
3453:
3441:
3436:
3434:
3432:
3422:
3413:
3404:
3400:
3373:Command rate
3359:
3330:
3316:
3302:
3288:
3274:
3245:
3231:
3217:
3188:
3174:
3160:
3146:
3132:
3103:
3089:
3075:
3061:
3047:
3018:
3004:
2990:
2976:
2947:
2933:
2919:
2905:
2876:
2873:
2869:
2866:9.38 ns
2863:8.54 ns
2860:7.92 ns
2855:
2852:9.79 ns
2849:8.96 ns
2846:8.33 ns
2826:
2823:9.35 ns
2820:8.48 ns
2817:7.82 ns
2812:
2809:9.78 ns
2806:8.91 ns
2803:8.26 ns
2783:
2780:9.32 ns
2777:8.41 ns
2774:7.73 ns
2769:
2766:9.77 ns
2763:8.86 ns
2760:8.18 ns
2755:
2749:9.32 ns
2746:8.64 ns
2726:
2723:9.14 ns
2720:8.20 ns
2717:7.50 ns
2712:
2709:9.61 ns
2706:8.67 ns
2703:7.97 ns
2698:
2692:9.14 ns
2689:8.44 ns
2684:
2678:9.61 ns
2675:8.91 ns
2655:
2649:9.76 ns
2646:9.05 ns
2626:
2620:9.92 ns
2617:9.19 ns
2597:
2594:9.75 ns
2591:8.75 ns
2588:8.00 ns
2583:
2577:9.25 ns
2574:8.50 ns
2569:
2563:9.75 ns
2560:9.00 ns
2555:
2546:9.50 ns
2526:
2517:9.31 ns
2497:
2491:9.91 ns
2488:9.11 ns
2468:
2465:9.72 ns
2462:8.61 ns
2459:7.78 ns
2454:
2448:9.17 ns
2445:8.33 ns
2440:
2434:9.72 ns
2431:8.89 ns
2426:
2417:9.44 ns
2412:
2398:
2369:
2363:9.34 ns
2360:8.49 ns
2355:
2349:9.91 ns
2346:9.06 ns
2326:
2317:9.23 ns
2312:
2303:9.81 ns
2298:
2269:
2263:9.12 ns
2260:8.24 ns
2255:
2246:9.41 ns
2226:
2217:9.60 ns
2197:
2188:9.70 ns
2168:
2162:9.69 ns
2159:8.75 ns
2154:
2145:9.38 ns
2140:
2111:
2102:9.33 ns
2097:
2083:
2069:
2040:
2026:
2012:
1998:
1969:
1960:9.75 ns
1955:
1941:
1927:
1913:
1884:
1870:
1856:
1827:
1813:
1799:
1770:
1756:
1742:
1724:933 MHz
1713:
1699:
1685:
1667:800 MHz
1656:
1653:
1649:
1640:9.70 ns
1620:
1591:
1585:8.71 ns
1582:7.74 ns
1562:
1556:9.00 ns
1553:8.00 ns
1533:
1527:9.20 ns
1524:8.18 ns
1504:
1498:8.93 ns
1495:7.86 ns
1490:
1484:9.64 ns
1481:8.57 ns
1476:
1447:
1441:9.38 ns
1438:8.25 ns
1433:
1424:9.00 ns
1419:
1410:9.75 ns
1405:
1376:
1370:9.62 ns
1367:8.46 ns
1347:
1341:8.75 ns
1338:7.50 ns
1333:
1327:9.58 ns
1324:8.33 ns
1319:
1310:9.17 ns
1305:
1291:
1262:
1259:9.55 ns
1256:7.73 ns
1253:6.36 ns
1233:
1230:9.84 ns
1227:7.97 ns
1224:6.56 ns
1219:
1213:8.91 ns
1210:7.50 ns
1205:
1199:9.84 ns
1196:8.44 ns
1191:
1182:9.38 ns
1177:
1163:
1134:
1125:9.00 ns
1105:
1096:8.57 ns
1091:
1082:9.64 ns
1077:
1059:933 MHz
1048:
1042:9.38 ns
1039:7.50 ns
1034:
1025:8.75 ns
1020:
1006:
992:
978:
960:800 MHz
949:
943:9.45 ns
940:7.27 ns
931:687 MHz
920:
911:9.00 ns
906:
892:
878:
860:666 MHz
849:
831:533 MHz
819:
815:
806:7.50 ns
801:
792:8.44 ns
787:
778:9.38 ns
773:
759:
741:533 MHz
730:
716:
702:
688:
670:400 MHz
659:
645:
627:333 MHz
616:
602:
584:266 MHz
573:
559:
541:200 MHz
529:
525:
511:
497:
479:200 MHz
468:
450:166 MHz
438:
434:
416:133 MHz
406:
405:
387:100 MHz
377:
375:
371:
353:Command rate
339:
328:
326:
325:megatransfers
321:
319:
314:
309:
306:
302:
298:
296:
291:
286:
284:
279:
274:
270:
265:
263:
259:
248:
245:
237:
227:
223:
217:
216:
211:This section
209:
205:
200:
199:
191:
189:
185:
181:
177:
174:
169:
166:
161:
159:
154:
150:
148:
144:
140:
136:
132:
126:
116:
114:
110:
106:
102:
98:
94:
84:
81:
73:
63:
59:
55:
49:
48:
43:This article
41:
32:
31:
19:
3609:
3602:
3595:
3587:
3580:
3571:
3563:
3535:
3528:
3518:
3496:
3489:
3481:the original
3470:
3439:
3421:
3412:
3403:
3388:Eighth word
3385:Fourth word
3379:CAS latency
368:Eighth word
365:Fourth word
359:CAS latency
322:
317:
310:
299:
295:underclocked
287:
266:
255:
240:
231:
220:Please help
215:verification
212:
170:
164:
162:
157:
155:
151:
146:
142:
138:
130:
128:
100:
96:
92:
91:
76:
67:
44:
3382:First word
3376:Cycle time
3361:Generation
362:First word
356:Cycle time
341:Generation
97:CAS latency
18:CAS Latency
3462:References
3367:Data rate
3332:DDR5-6600
3247:DDR5-6400
3190:DDR5-6200
3105:DDR5-6000
3020:DDR5-5600
2949:DDR5-5200
2878:DDR5-4800
2872:DDR5 SDRAM
2828:DDR4-4800
2785:DDR4-4600
2728:DDR4-4400
2657:DDR4-4266
2628:DDR4-4200
2599:DDR4-4133
2528:DDR4-4000
2499:DDR4-3866
2470:DDR4-3733
2371:DDR4-3600
2328:DDR4-3533
2271:DDR4-3466
2228:DDR4-3400
2199:DDR4-3333
2170:DDR4-3300
2113:DDR4-3200
2042:DDR4-3000
1971:DDR4-2800
1886:DDR4-2666
1829:DDR4-2400
1772:DDR4-2133
1715:DDR4-1866
1658:DDR4-1600
1652:DDR4 SDRAM
1622:DDR3-3300
1593:DDR3-3200
1564:DDR3-3100
1535:DDR3-3000
1506:DDR3-2933
1449:DDR3-2800
1378:DDR3-2666
1349:DDR3-2600
1264:DDR3-2400
1235:DDR3-2200
1136:DDR3-2133
1107:DDR3-2000
1050:DDR3-1866
951:DDR3-1600
922:DDR3-1375
851:DDR3-1333
822:DDR3-1066
818:DDR3 SDRAM
732:DDR2-1066
528:DDR2 SDRAM
390:10.000 ns
384:10.000 ns
347:Data rate
313:cache line
269:pipelining
54:improve it
661:DDR2-800
618:DDR2-667
575:DDR2-533
532:DDR2-400
437:DDR SDRAM
431:75.00 ns
428:45.00 ns
425:22.50 ns
419:7.500 ns
413:7.500 ns
410:133 MT/s
402:90.00 ns
399:50.00 ns
396:20.00 ns
381:100 MT/s
293:which is
273:bandwidth
149:the row.
131:word line
70:July 2019
58:verifying
3620:Category
3450:See also
470:DDR-400
441:DDR-333
139:bit line
180:gibibit
158:active,
147:refresh
135:MOSFETs
52:Please
3543:
407:PC133
378:PC100
303:(DDR)
188:Mibits
3501:(PDF)
3395:Notes
3364:Type
374:SDRAM
344:Type
262:SDRAM
176:SDRAM
113:SDRAM
3541:ISBN
789:4.5
704:4.5
499:2.5
456:2.5
290:DRAM
105:DRAM
3347:34
3318:32
3304:34
3290:36
3276:38
3262:40
3233:36
3219:38
3205:40
3176:30
3162:32
3148:36
3134:38
3120:40
3091:30
3077:34
3063:36
3049:38
3035:40
3006:34
2992:36
2978:38
2964:40
2935:34
2921:36
2907:38
2893:40
2857:19
2843:20
2814:18
2800:19
2771:17
2757:18
2743:19
2714:16
2700:17
2686:18
2672:19
2643:19
2614:19
2585:16
2571:17
2557:18
2543:19
2514:18
2485:17
2456:14
2442:15
2428:16
2414:17
2400:18
2386:19
2357:15
2343:16
2314:16
2300:17
2286:18
2257:14
2243:16
2214:16
2185:16
2156:14
2142:15
2128:16
2099:14
2085:15
2071:16
2057:17
2028:14
2014:15
2000:16
1986:17
1957:13
1943:15
1929:16
1915:17
1901:19
1872:15
1858:16
1844:17
1815:14
1801:15
1787:16
1758:12
1744:13
1730:14
1701:10
1687:11
1673:12
1637:16
1608:16
1579:12
1550:12
1521:12
1492:11
1478:12
1464:16
1435:11
1421:12
1407:13
1393:15
1364:11
1321:10
1307:11
1293:12
1279:13
1179:10
1165:11
1151:12
1065:10
980:10
966:11
305:RAM
224:by
184:MiB
173:GiB
99:or
56:by
3622::
3509:^
3430:^
1335:9
1250:7
1221:7
1207:8
1193:9
1122:9
1093:8
1079:9
1036:6
1022:7
1008:8
994:9
937:5
908:6
894:7
880:8
866:9
837:7
803:4
775:5
761:6
747:7
718:4
690:5
676:6
647:4
633:5
604:3
590:4
561:3
547:4
513:2
485:3
422:3
393:2
101:CL
3549:.
3440:N
247:)
241:(
236:)
232:(
218:.
83:)
77:(
72:)
68:(
50:.
20:)
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