- Feb 22, 2009
Start by lowering your CPU multi to x16...that way we can keep the CPU out of the picture for a few minutes. To ensure consistency, disable all power saving and throttling features, and set your vcore to 1.25V and enable load line calibration.
Next, back your memory way down to the lowest multi, leave the timings at CL9 how they are now, that should be fine. Lock your vDIMM at 1.65V and your VTT to 1.35V.
Also, change all other BIOS voltages/timings back to "auto".
Now, we are ready to find your basic Bclock limit. Start pushing it up from 180MHz in 5MHz increments with a 5 min stability test each time. If you make it to 210MHz, then drop back to 200MHz and see if the stability test will pass for 30 min. If you cannot make it to 210MHz, try to give it another bump in VTT, to 1.4V or so, and try again.
If you get your Bclock stable at 200MHz with these loose mem timings, the next step is to tighten them up. So raise your mem multi back up (one step at a time) to where you want it...checking for basic (5 min) stability at each step. Although for now, do not exceed the manufactures specs for the memory speed/timings. If you find an instability, raise the VTT a little.
After getting your Bclock and memory stable, we can go back to working on your CPU. VTT & vDIMM are the only voltages we should have played with much so far, because we now have a stable Bclock & mem settings, we can freely OC the CPU and our only variables will be CPU voltage, and heat.
OCing is all about controlling your environment, isolating one component at a time, and pushing each piece to it's limit.
Following Miahallen's instructions from another post, I fiannly got my 4.2 stable at 1.44V.
I of course wish the voltages were lower, but hey under prime they only hit 75°C
First let me express my gratitude to Miahallen and all those others that helped.
My settings ended up being.
Power Saving Settings off.
QPI/Vtt (DMI): 1.35V
DRam Multi X6
DRam Timings: 7-7-7-21
DRam Freq: 630MHz
Everything else is left Auto.
I see why having DDR3 2000 Ram is important now. Had I put my DRam Multi at X8 with 210 Bclk puts the DRAM running at 1680 (840)MHz. Since I guess this ram doesn't like speeds higher than 1600, it would require going higher or lowering the Bclk and raising the multi. It was definitely fun doing this with systematic instructions. It still took me about 3 hours, but thats way less time than its taken me this last week.