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Please help me confirm proper timing settings!

post #1 of 18
Thread Starter 
I recently got a new computer and I know the timings are not set correctly, but I've never messed with ram timings before and don't want to screw things up.

Using an Asus P5N-E motherboard with XMS2-6400 Corsair 2 x 1GB 800Mhz.

I've read the sticky explaining ram timings, but all these different numbers are just confusing me.

From a seperate page, I found the following info:
Quote:
- Tested at EPP SPD settings (4-4-4-12) at 2.1V at 800MHz
- JEDEC standard 5-5-5-18 values at 800MHz
- EPP standard 5-5-5-15, 2.1V values
- Timing: 4-4-4-12 (CL-tRCD-tRP-tRD)
And cpu-z shows the following:


My BIOS has the following options in regards to ram timing:
tCL (CAS Latency)
tRCD
tRP
tRAS
Command Per Clock (CMD)
tRRD
tRC
tWR
tWtR
tREF
tRD
tRFC
Async Latency


So far I think I should have tCL set to 4, tRCD set to 4, tRP set to 4, and tRD set to 12, but beyond that, I have no idea (and I'm not even sure if I'm right about what I've assumed so far!)

Any help would be well appreciated, and I apologize for the long drawn out post; I am not quite sure what info is essential and what is not.
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post #2 of 18
Ouch - 5-5-5-31 :O

CL =4
tRCD =4
tRP =4
tRD = 12
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post #3 of 18
Command clock can be set to "1T" or "2T"

It should always be at 1T, because it improves performance. Run at 2T if you have stability issues.
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post #4 of 18
As strange as it sounds I dove right in. I tightened up every value by 1, ran membench and just messed around until I noticed an improvement. If the computer didn't restart I'd clear the CMOS and start again.

Correct me if I'm wrong but you can't fry your memory if you don't increase the voltage since if your timing are too tight you simply can't boot.
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post #5 of 18
Thread Starter 
So I should change the following values?

CL = 4
tRCD = 4
tRP = 4
tRD = 12
Command Per Clock = 1T


Should I just leave the rest as auto?

And in regards to testing stability, is there anything special about memtest86 I should know about? Just let it run a cycle (or two to be safe?)


Thanks for the help guys, I appreciate it.
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post #6 of 18
Well, for a start, just drop the Tras to 14. Dont want to change lots of timings at once, as it may still be instable, and you dont know what timing is causing the instability.

And change the Command Rate to 1T.

With Memtest, run the version that boots of a floppy disk. Restart, have Memtest open, go through the menu, and manually select Test #5. If that runs, without errors, 3 times, you're good to eithe tighten another timing by 1, or increase the FSB a bit more.

When it fails, and you cant get it to pass, no matter what, then for more stabilty, have memtest loop through all the tests (it does that automatically) 2 or 3 times. It'll probly fail, and a thoroughly stable clock will probly be achieved by dropping FSB by 3Mhz.

Quote:
Originally Posted by Perry View Post
Correct me if I'm wrong but you can't fry your memory if you don't increase the voltage since if your timing are too tight you simply can't boot.
No need to be corrected. The most frequent symptom of unstable memory is failure to boot. Either a beep and no activity at all, or it will boot-up for a few seconds, then restart and repeat til you turn it off.
post #7 of 18
Thread Starter 
If I may ask, where did the Tras = 14 come from? Seems kind of like an arbitrary number, but I'm sure you have a reason for it.

And if I do have failure to boot, resetting my CMOS should clear the issues up, correct?
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post #8 of 18
As a rule of thumb, Tras should be equal to, or greater than, the sum of the 2nd and 3rd timings. So, 14 is not too high, but not too small. Dont want it too high, as Trc should be equal to, or greater than, the 4th and 3rd timings added together.

So, Tras should lie between 10 and 17.
post #9 of 18
Thread Starter 
Alright, thanks.

Does that mean Trc should be ~18?

And is the "Block move, 64 moves" is the correct test? I'm using the *.iso version of memtest, not sure if there are any differences.


Edit: Yipes! Got a ton of errors part of the way through the first run of test #5 with tRAS = 14 and Command Per Clock = 1.



Where do i go from here?
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post #10 of 18
Well, its best to give the timings lots of space, keep them loose. When overclocking memory, 99% of the time is spent waiting for Memtest to finish, so you can see if you have overtightened one of the timings or not, or if you're making it run too fast.

Yup, thats the correct test. And, the correct version of memtest also.

This guide explains every timing available on DFI boards. Although you dont have a DFI board, all your timings will be on the guide. But, as you have DDR2 memory, multiply each suggested timing by, say, 2.5. Have to use Google cache, as its on DFI Street (I have it printed out.)

I used this guide to oc my memory. Time consuming, but you know you're covering every angle for possible instability.
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