Quote Originally Posted by dejanh View Post
Do you have ACPI 2 enabled?




I think that it may be a per-chip thing, except I have no explanation for it short of some chips actually having faults. However, I'd think this would be a pretty high number of faults as both i7 940s I use have the same problem and they were picked totally at random, and a lot of other people are reporting not being able to stabilize anything with 20x multiplier. The flip side of this is that the failure rate is surprisingly high for it to slip past Intel's QC which then points to the boards being the culprits. Could anyone confirm that this does not in fact happen on non-Asus boards?

In terms of stability, In theory, 20x200 should be more stable than 19x211 or 21x191 as one pushes the BCLK close to the limits, and the other pushes the multiplier to the limit (at least for i7 920).

Anyway, I am again failing on 20x200. It seems that whatever happened yesterday when I ran it was a fluke. I managed to do a few runs with it fine, but now again 20x200 is not stable where as even 216x19 is stable (but too hot for my taste). Running on R2E here...

Chip or mobo either way it is BS. If it is the chip, Intel will probably just fix it all in the next stepping as opposed to providing any kind of good workaround. If it is the mobo, I am not expecting a fix ever.
I agree this is very weird. My i940 with any bios and turbo off, will run 4ghz, 20x200, 21x191, 22x182 all at exact same vcore of 1.35bios and all 12 hrs prime stable. maybe if people list mobo, all settings, or ? cpu batch #'s and see if anything in common on those having problems with 20 multi vs not. Be interesting if could find any common issues. (I cant test with turbo on since 20x200 turbo on i940 is 23x200, 4.6 is not going to prime.)