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Can't OC RAM

post #1 of 3
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I just noticed recently that I've been running a OCed rig which underpreforms the original stock! The processor was running better, but I was using a 1:1 ratio, meaning my ram was down to 320, instead of 400.
But now when I try to use the 4:5 ratio, which could give the perfect OC, it won't start! The computer just sits there and "clicks" a little, and then resets the clocks and starts...

What is causing this? For some reason I can't OC at all with a 4:5 ratio. Is my ram too cheap?
Teh Küb
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Teh Küb
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post #2 of 3
Well first of all you shouldnt try to run the ram faster then the CPU, theres no performance increase when doing so, if you are running a 1-1 ratio with the FSB then your chance's for a higher overclock is alot better then trying to overclock the ram and the CPU. Also if yould be a bit more specific about what type of ram you have it might make things easier for someone to give a couple pointers.

As it stands when you have your FSB at 164-65 and try to run your ram at 400 it will overclock the ram to around 231 or DDR-462. And unless you do some tweaking you are not going to get the ram to overclock that far especialy if its cheapo ram. Your best bet is to either run it 1-1 with your CPU or try for some Vdimm increases and looser timings, please note if you loosen the timings performance will be slightly worse. 1-1 and tighter timings is your best option when it comes to ram/cpu ratio.
My System
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My System
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post #3 of 3
Quote:
Originally Posted by Adeoliver
Well first of all you shouldnt try to run the ram faster then the CPU, theres no performance increase when doing so, if you are running a 1-1 ratio with the FSB then your chance's for a higher overclock is alot better then trying to overclock the ram and the CPU.
This is a popular misconception. Some systems enjoy a performance gain, often significant, but running a divider that favors the RAM (yes, I have done this personally, and the benchmarks don't lie). With a 133 MHz CPU and 200 MHz RAM, there is a lot of room to overclock the RAM even with a divider that favors the RAM.

First, use a 1:1 ratio to find the max OC for your CPU. It's unlikely you'll get the CPU to 200 MHz, so your RAM won't even break a sweat. Run several benchmarks at this point. Then, drop the CPU back down to stock, insert a divider, and slowly start OCing again. Run Memtest86 frequently as you go to make sure your RAM is stable. You'll likely need to tweak your timings and/or vdimm. Once you have find the max OC with a divider, run the same set of benchmarks, and go with whatever works best for you. I have a 2.4B with PC2700 RAM, and it runs significantly faster at 4:5 than at 1:1. Although it will take some time and tweaking, it's worthwhile to go through the exercise.
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Sig rig
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