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Corsair XMS Expert OC Help

post #1 of 11
Thread Starter 
Hey guys well i was trying to OC my ram which are two pair of 512mb

CMXP512-3200XL's and well the divider on my system i guess is automatic unless

i can not find where it is located but anyways i can ramp my FSB to about

220MHz with a x's12 multiplier and get the ram frequency to 220 and anything

after that the ram divides itself from 400 to 333MHz and i have tried loosening

the timings and upping the vcore but nothing i seem to do affects the MHz of

this ram. Is there something im missing or doing wrong? BTW the stock timings of

this RAM is 2-2-2-5. can anyone help?
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post #2 of 11
Okay, your post is really hard to read. Use normal spacing and punctuation. As for your problem, I'm having trouble trying to decipher what you are actually asking, but I think the reason your RAM speed it changing is because it is trying to maintain a 1:1 ratio no matter what. Find a way to disable that and you should be set. Again, it's too damn hard to read your post and I'm not even sure what you are asking, but this souunds about right...
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post #3 of 11
Your divider is set to auto. You need to change this to 1/1.
This guide helps for overclocking memory.
post #4 of 11
Thread Starter 
Yeah i cant find anywhere i can change my divider. My BIOS is made by American Megatrends does anyone know what they call it in that brand of BIOS?

EDIT: i have found something called MemClock Mode i set that to limit and i set the Memclock Value to 250MHz and it pushed my DDR400 ram to DDR500 so i guess thats all i had to do???

EDIT: well i have my RAM running now at 466 but i cant raise my FSB much at all and it becomes so unstable cant even get past windows logo is there something else i should loosen up to beable to overclock my CPU at the same time? i loosened the timings and it doesnt really help much
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post #5 of 11
Follow the guide I linked you to, and start loosening your timings. I couldn't oc my mem past 434MHz without loosening the timings a tad.

The way I understand the Memclock value is it is basically a divider. So, take the value you've set it at (250 in this case) divide it by 200, giving you 1.25. So, your memory SHOULD be running at FSBx1.25.

If you want to have your memory running slower than your CPU, allowing the CPU to go further, set Memclock to a value below 200.
post #6 of 11
Thread Starter 
oh i see pretty much if i set the value to 250MHz for the RAM that means the RAM wont go below that amount set there for as i overclock my CPU the ram cant keep up and since its trying to divide the timings for a divider it becomes unstable because the ram is too slow.
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post #7 of 11
No, your memory is too fast, not too slow. You CPU is overclocked to 2.94GHz, which would mean your FSB is probly at 245MHz. Now, this means your memory is running at 306.25MHz, which is DDR612.5. I have never seen any DDR1 memory run at that speed.

Change the Memclock value to, say, 166. Your memory will then be running at 245*(166/200) = 203.35MHz (DDR406.7), which is just over stock speed.
post #8 of 11
Thread Starter 
really!? wow i didnt know of it that way so then do you think that since my divider was trying no matter what to stay 1:1 that when i i got to 245 fsb it became unstable?
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post #9 of 11
Your 'divider' was trying, no matter what, to stay 1.25:1, as the Memclock value was set at 250.

If you do want to overclock your memory, read this guide.
If you don't want to overclock your memory, then set the memclock value so that...

(Memclock value/200)*FSB is equal to/less than 200
post #10 of 11
Quote:
Originally Posted by thealmightyone View Post
No, your memory is too fast, not too slow. You CPU is overclocked to 2.94GHz, which would mean your FSB is probly at 245MHz. Now, this means your memory is running at 306.25MHz, which is DDR612.5. I have never seen any DDR1 memory run at that speed.

Change the Memclock value to, say, 166. Your memory will then be running at 245*(166/200) = 203.35MHz (DDR406.7), which is just over stock speed.
Lmao, I've seen alot of DDR running 325-340 MHz.
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