Originally Posted by AliceInChains
I noticed with 1156 the i7's need more qpi/vtt voltage then the i3's. It might have something to do with the difference in architecture. The 32nm i3 has a better imc than the 45nm i7.
As far as qpi/vtt voltage with the i7, I noticed if you have 2 gpus it will need an substantial increase in qpi/vtt voltage with any overclock. The i3 on the other hand can overclock like crazy with barely any qpi/vtt voltage bump. Not 100% sure why this is.
When I had my two 1156 rigs I only used prime95 for stability testing. And generally speaking, while stress testing, a bsod would usually mean qpi/vtt bump is needed. While a worker thread stopping or any other p95 error usually indicated vcore bump was needed. Funny, because with sandy bridge it is the exact oposite. Sandy bridge: bsod (124,or 101) means vcore bump is needed, and errors in p95 means unstable memory timings/memory overclock, or vccio (qpi) bump is needed.
Just when you get used to something Intel flips it around and upside down.
edit: op btw, gigabyte p55 board have known issues with intel turbo feature. I had the hardest time getting turbo to work properly on my p55-usb3. Ended up getting an evga p55-sli-ftw, and it gave me no problems what so ever.
try running linx, or prime95. If you get no errors or bsod, then you have a software/driver/os problem and a clean install of windows may be necessary.
THank you for your response.
In my case, as long as I stay away from C3/C6 Enabled, the system is flawless. So I'm with 22X/24X TurboBoost only (up to 27X with C6 enabled).
I don't think it's related to QPI/VTT for *stock* memory and CPU frequencies.
Later I will put an old PCIe NVIDIA 7300GT and see if the video card is failing with the C3/C6 power state, because the amdkmdap ATI driver fails frequently after some usage.
It's strange that I can play e.g: 1 or 1 1/2 h of Fallout 3 or intense 3DMark11 benchmarking and after that the video card starts to fail until a complete freeze arrives.
May be it's temp related? I've monitored up to 75ÂºC in Fallout 3 and 87ÂºC in Furmark.
However, the strange thing is that it worked 100% the the i3 and works 100% with the i7 WITHOUT C3/c6 enabled.
Also, I don't think the CPU is failing, because reaches all it's power states OK with C3/C6, but I will test with the other old card and tell the results.
If it works, maybe it's some related to C3/C6 states and PCIe controller???
Again, thanks for help!Edited by indiocolifa - 8/2/11 at 7:51am