Core i7/X58 Overclocking Thread

[SteveRo]

Ok guys. This thread is 105 pages so obviously I can't be expected to read it to look for a solution.

I have an Asus P6T Deluxe, with the 1102 BIOS. I just got my i7 under water, and the friggen 20x multiplier is driving me nuts. It WILL NOT stabilize at any bclock above 200 basically. Trying to load the CPU will result in an instant BSOD.

But, 222 * 19 works fine, and so does 200 * 20 with turbo enabled.

So what the hell is the issue here? Also, I need 1.5v for the CPU set in the BIOS in order to be fully stable (pass prime95) at 222x19. It seems like my CPU is either a dog, or I have no idea what I'm doing. Also, I can't seem to get my memory stable at stock speed, voltage and timings. DDR3 1600 will crash while running prime95... and 1mhz above that won't even load windows. I mean wtf it can't be that bad??! Please I am running in circles here, what can I do/try to get some better results here?

Welcome 003 - yes many of us have discovered there is something unusual with the 200 bclock - particularly 20x200.
Even when we can get 19x211 or 21x191, 20x200 will not work.
I am impressed you can get a 222 bclock stable, best I can do is 211.

Regarding your memory - when at high bclocks (190+) you need to keep the mem multi at 6, 8 probably no greater than 10.
The uncore multi needs to be at least 2x you mem multi, preferably 2x plus one.
So for example mem at 6x, uncore at 13x and qpi at 36x.
QPI must stay below 4k (or it will not boot I think).
Uncore wants to be below 4k, sometimes you can run a little over 4k.
As you increase your mem multi, the uncore multi very quickly begins to push you into the 4k barrier.
For example if you are at a 205 bclock, if you set mem multi to 8 for 1640 memory, your uncore needs to be at 17 or 3484
With qpi set to 36 you are at 3690 qpi
I think most folks find better stability keeping uncore lower than qpi freq at about 9/10 ratio.
Using the above example - uncore/qpi: 3484/3690=0.944
Another thought - does your memory have xmp settings?
If yes, turn xmp on and see what your memory maker has the xmp speed and v's set to.
You may need to check these values in windows - my mobo just shows them as auto (when xmp is turned).
Hope this helps.