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RAM timing question

B

Ben

Golden Member
I'm a little lost with some of these new timing options that seem to have showed up with DDR.

For example, the RAM I have says it will run at trcd-2, trp-2, CASlat-2, Tras-5. My BIOS lists:

Idle cycle limit
Page hit limit
Irc cycle
Irp cycle
Tras Cycle
CAS latency cycle
Tred cycle

I can plug in the obvious number like CAS latency, and tras, but I don't have trcd in my BIOS or a trp. And then I have Idle cycle limit, page hit limit, Irc, Irp, and Tred in the BIOS that I have no idea what values to use for. Is Tred and Trcd the same thing? Is Irp and Trp the same thing?

Is there anywhere on the www or anyone here that can elaborate on this a little?

Also, I'm currently running the RAM on SPD which works good, but I don't know what the SPD settings are. When I turn on SPD, all the RAM timing settings gray out in the BIOS and revert to some factory default value. Is there a utility that can tell me what my RAM is currently set at using SPD? I tried WCPUID and it's not detailed enough.
 
😉 Could try SiSoft Sandra (free).

🙂 Usually these are latency and wait-states, lower is better and CL2.0 should run all settings at their lowest.

😀 SPD automatically detects what the RAM can do as all decent and modern RAM can report the info. You may get it faster but I've always found SPD to be a very stable and fast setting to use.

🙁 Don't forget, if you're adding it to existing RAM then the perf is dictated by the slower stick ... beware!
 
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