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Cruicial DDR500 Timing settings? Help!

post #1 of 41
Thread Starter 
I just got some Ballistix Tracer (4 x 512) pc4000 DDR500 modules for my Asus A8N32-SLI Deluxe motherboard.

The guy at Crucial suggested these settings in the Bios:

2.5 Cas Latency. I found this one no prob

4 - 4 - 8 Detailed Timings Have no idea where to find this one?

Front Side Bus of 250 Mhz. Think I found this one, but it is called Memory Timing?

2.8 on the voltage. Found this one ok.


Can anybody tell me where the settings for the 4 - 4- 8 is and the Front side bus, or walk me through it?


Thanks!
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post #2 of 41
Ok, so you found memory configuration. The timings of your memory are 2.5/4/4/8 according to the Crucial guy. The order of the numbers should be CAS-tRCD-tRP-tRAS

Thus in your BIOS:
CAS Latency = 2.5
RAS/CAS Delay = 4 CLK
Row Precharge time = 4 CLK
Min Active Ras = 8 CLK

Memory CLK should be set on 250 MHz. However, I disagree with the Crucial guy on this one. There is no performance gain by setting the memory clock faster than the FSB of the CPU. (Memory can’t process information any faster than the CPU supplies it). Set this on 200MHz, and then when you start overclocking your CPU, the memory should be on 1:1 with your CPU.

Ok guys, if I miss anything, or am incorrect about any of my comments, please help out! I don’t have this MoBo myself, and just rely on the online manual.

Here is a little information about memory timings and what they mean:
http://www.techpowerup.com/articles/...AMD/memory/131
    
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post #3 of 41
Thread Starter 
Thanks so much!


I changed everything (except the Cas latency) and no prob, but i still got a lot of errors when running memtest86.

???? Not sure what is up?

So , I then adjusted the Cas Latency down to 2 and then the computer just stopped working. Nothing. Couldnt get it to boot at all. I finally had to clear the cmos.

Any ideas?
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post #4 of 41
try running the other timings at a lower value, the CAS of 2.5 wont go any lower
chozart said run the RAM on a 1:1 divider, and hes right

edit: if memtest is giving you errors, try the CAS at 3
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post #5 of 41
Also, and here I might be wrong, I've heard that AMD systems are not too happy with all four RAM slots filled... Please correct me if I am wrong here (maybe 2 x 1GB would have been better?)
    
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post #6 of 41
overclockign with 4 ramslots will be less stable, stresses the memory controller alot more than 2 slots

and you OC wont be as good or as high

id return the 4x512 and get the 2x1gig and slap whoever told you to get 4 sticks of ram
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post #7 of 41
Thread Starter 
Thank so much guys!


Did I interpret you wrong when I reduced the Cas to 2? I thought you said to run it at 200mhz , but I am a newb and probably didnt read into what you were saying correctly?


Yeah, a few fellas here on the forums with high reps recommended the 4 modules for better oc potential. Son of a ..............

I was going to go with 2. grrrr. Oh well. I will just have another corona i guess!
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post #8 of 41
maybe they thougth your werent gonna OC muchor something like that
if your OCing, keep the CAS at 2.5 or 3
if you go HIGH, you want 3, its ok if your running at that highspeeds anyway

also you can try runngin the ram:cpu at 4:5 or 3:4 dividers and play around with ram voltage

also have your read the AMD overclocking guide?
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post #9 of 41
CAS Latency and clock speed are not the same. Latency should bet set at 2.5. 2 is likely to be to tight for this RAM, moreover if you're going to overclock.

The Speed is set under the Memory CLK (Clockspeed). Here it should be set at 200.
    
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post #10 of 41
Thread Starter 
Thanks to both of you! I left you rep points too!

I set the Cas latency to 3. Things seem to be working fine, but still getting a lot of errors on memtest86 at about 68% way through the test.

You had said something about tightening the timings a bit?
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