Originally Posted by Kaynar
Using 20x200 on my 4ghz i7 930 but as other stated odd multipliers do better in OCing. Its weird that you need so much Vcore for 4Ghz since I only use 1.34-1.36v.
For me as well anything above 4Ghz is unstable, but i got a lower model than yours. Turbo is nice if you get it stable but don't start by having it enabled. Let it disabled and reach higher frequencies, its more important...
I also found my system was only stable if running my DominatorGT ram at v1.665 and I couldnt set it to 2000mhz (for which it is rated) since the 2:10 ratio would freeze my PC, had to keep 2:8 and go for lower CAS and 1T. Still gives 19GB/s so its nice.
I would be interested to know all your major bios settings, I have not come across a 930 that will not do more than 4gig unless you have a setting out so to speak, whil;st no doubt there are "dog" 930 CPU's out there, 8 out of 10 OC failures with these chips tend to be Bios settings..... mine is in fact a 930 which runs 4.3gig 24/7 but it took me a lot of tweaking to get it there stable.
Incidentally, the 2:8 memory divider stability thing is fairly commonplace to gigabyte x58 boards.