** Official ** Gigabyte UD3 P45 Series -- EP45-UD3 / EP45-UD3R / EP45-UD3P

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What settings are you using? Also remember these boards seem to undervolt on vdimm so you may have to use 1.82-1.84 in bios/et6. Check your actual voltage with everest or even HW monitor in ET6.

Is it possible that the CPU doesn't like a divider and does best at 1:1/200d? I have only run this e8400 using 200d pl9 due to not having a 4gb kit that would go much past 1130. On other boards I have had CPU's that would clock well at 1:1 only and some that seemed to like a divider. I know the chip is good up to 495x9 prime stable 8hrs. Maybe I am wrong about this idk.
Cpuz hw monitor and Everest shows 1.79v when set to 1.82v in bios, maybe needs another bump. Went as high as 1.40v mch but that is to high for 1150.
I also put this ram in my other rig with a q9550 and could not get it to boot into windows at 482x8.5 all the way up to 1.35vcore 1.40v mch, I have run this chip at 500x8.5 1.35v bios 240b prime stable but using a 2x1gb kit of d9's.

Thanks