I recently built a computer using a gigabyte GA-Z77X-UD3H (F-11, later F-17 bios) motherboard with a i5 2500k processor, Hyper 212 EVO, Gskill Ripjaws 8gb 9 9 9 24 2t 1600, samsung ssd 830 series 256gb, thermaltake 675 watt psu, EVGA GTX 680 SC. It runs fine...until I try to OC it. The first problem I noticed was when I set the multiplier to 45 (4.5Ghz OC) and left the vcore on auto. The core temp on the hottest core hit 98C a few seconds after starting the prime 95 blend test and vcore had climbed to over 1.5 according to cpuz. I shut down prime 95 and did some experimenting and found that setting vcore to 1.280 was enough to run prime 95 stable for about 12 hours with max core temp at 68C at 4.5Ghz. At this point I had enabled XMP and the memory was running at 9 9 9 24 2t 1.5v, vcore was set manually to 1.280v, multiplier at 45 and running stable. Then I started having random boot-loop problems when ever starting from a cold boot, but no problem when restarting. I reloaded optimized defaults and no boot loops. Then I changed only the multiplier to 38, 100Mhz above stock turbo, and the boot loop started again. I rma'd the motherboard and it made no difference. I finally found a solution to this but it seems something with the motherboard is definitely bugged to cause this problem. The solution was to disable C1E and C3/C6. I also disabled turbo and left EIST enabled. I have googled "boot loop" and it seems gigabyte boards are the only ones plagued with this problem. Are there any consequences to running with C1E and C3/C6 disabled?
edit: changed 2600k to 2500k
edit: changed 2600k to 2500k
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