Memory speed timings and bandwidth

BS Dave · 24 Dec 2014 at 08:29

So I've wondered this for a while.

If I have some ram running at 1600mhz with timings 8 8 8 and some running at 2400mhz with timings 12 12 12, are the timings in absolute terms the same in ms?

Ie because ram b is running 50% quicker than ram a the timings even out?

12/2400=8/1600? So a would be preferable because of the greater bandwidth and same absolute timings?

Thanks

Silent_Scone · 24 Dec 2014 at 09:42

there's a balance on various platforms. E-platforms are all about the additional bandwidth, but lower latency at high speeds is always preferable obviously.

For example CL9 or 8 on X79 at 2133 is quite reasonable compared with say CL11 2400. Whether you'll notice any difference between this and also command rates is down to your workload.

wazza300 · 24 Dec 2014 at 11:50

you can use maxmem to test bandwidth and latency

the latency will be less with tighter timings

Minstadave · 24 Dec 2014 at 11:51

I think RAM timings are in milliseconds, so frequency shouldn't change the actually values.

BS Dave · 25 Dec 2014 at 23:34

Thanks minstadave that's what I wanted to know

FredFlint · 3 Jan 2015 at 05:11

Minstadave said:
I think RAM timings are in milliseconds, so frequency shouldn't change the actually values.

RAM timings are in nanoseconds not milliseconds, here is some info:http://en.wikipedia.org/wiki/Memory_timings