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Memory Timings

post #1 of 17
Thread Starter 
Hey everyone,

I am new to this forum and new to the whole experience of overclocking. I decided to start my overclocking with something simple. Changing my memory timings. I started with this:
CAS Latency: 3
RAS/Row Precharge (tRP): 4
RAS-to-CAS Delay (tRCD): 4
Row-active-delay (tRAS): 8

And tired to do this:
CAS Latency: 2
RAS/Row Precharge (tRP): 2
RAS-to-CAS Delay (tRCD): 2
Row-active-delay (tRAS): 6

When I tried to reboot I got an error. It read:
CMOS Checksum error.
If your Operation System has install on SATA HDD already. Please check SATA access mode and Hard Disk Boot priority.

Before I start to fiddle with the timings again I would like to know exactly what went wrong. Any help would be very much appreciated.
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post #2 of 17
Dont change all the timings at once, just one at a time
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post #3 of 17
Quote:
Originally Posted by dan0964 View Post
Dont change all the timings at once, just one at a time
That is the NUMBER 1 rule with memory overclocking.

Also, what SPEED are you trying to run these timings at? The ONLY memory that can run at 2-2-2-x is BH-5, but only at DDR400-ish.
post #4 of 17
The original Ballistix does 2-2-2-6 @ DDR400

His problem is he went way to tight on the timings. Most that run that tight can not OC very far with out relaxing them.

If you have default CAS4 DDR400 it likely won't alow much timing tightening.
    
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post #5 of 17
Thread Starter 
Damm it. I was able to change Row-active-delay (tRAS): from 8 to 6 without problem but when I changed RAS/Row Precharge (tRP) from 4 to 2 my computer would not boot. Even worse was I could not access the BIOS and so could not change the settings back. I had to get the BIOS chip replaced to get my computer working again.

I have updated my computer specs with my type of ram and would appreciate any advice. Also why was I not able to access the BIOS. I thought that the worst that could happen when changing the memory timings is I would not be able to boot.
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post #6 of 17
Quote:
Originally Posted by futa_demon View Post
Damm it. I was able to change Row-active-delay (tRAS): from 8 to 6 without problem but when I changed RAS/Row Precharge (tRP) from 4 to 2 my computer would not boot. Even worse was I could not access the BIOS and so could not change the settings back. I had to get the BIOS chip replaced to get my computer working again.

I have updated my computer specs with my type of ram and would appreciate any advice. Also why was I not able to access the BIOS. I thought that the worst that could happen when changing the memory timings is I would not be able to boot.
You just had to reset the CMOS. It's a little 3 prong header by a little watch battery. Just take the thing that's connecting two of the prongs and put it on the other one and middle one.

And yeah, 2-2-2-6 is WAY too tight for RAM timings. Mine can run at 2-3-3-6 stock, but for DDR480 I need to go 3-3-3-8.
post #7 of 17
Thats where a cmos reset comes in handy. Read your manual on how to do it.
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post #8 of 17
Thread Starter 
I looked in the motherboard manual and it said that I could reset the cmos by removing the battery for 10 minutes before putting it back in. I was wondering if any of you have heard of doing it this way. Also I need to find some more detailed instructions for reseting the cmos. Do any of you know where I might find some.
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post #9 of 17
Yes, you can remove the battery for 10 minutes, but be sure to also unplug the power cable.

Here's a little MS Paint ftw.
post #10 of 17
Thread Starter 
So I first turn off computer. Reset CMOS and then turn back on computer. Thats it is it. I don't have to flash BIOS or anything like that.
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