RAM speed CAS latency chart

cyclone3d

[H]F Junkie
Joined
Aug 16, 2004
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Since there are so many threads that pop up about RAM speed and CAS latency, this should help with giving a general idea of the relation of different speeds and latencies.

The throughput relation will usually correspond pretty closely to this chart from what
I have seen in my testing.

The latency numbers are in nanoseconds rounded to 3 digits of accuracy.

Code:
					RAM SPEED			
		1066	1333	1600	1866	2000	2133	2400
CAS	6	5.629	4.501	3.750	3.215	3.000	2.813	2.500
	7	6.567	5.251	4.375	3.751	3.500	3.281	2.917
	8	7.505	6.002	5.000	4.287	4.000	3.751	3.333
	9	8.443	6.752	5.625	4.823	4.500	4.219	3.750
	10	9.381	7.502	6.250	5.359	5.000	4.688	4.167
	11	10.319	8.252	6.875	5.895	5.500	5.157	4.583
	12	11.257	9.002	7.500	6.431	6.000	5.626	5.000
	13	12.195	9.752	8.125	6.967	6.500	6.095	5.417

If you need to extrapolate more figures for speeds other than these, just take the CAS number and divide it by RAM speed divided by 1,000.

CAS / (RAM SPEED / 1,000)
 
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