After going away I returned and gave another go at my OC. I have come to the conclusion that the CPU has degraded. I was able to do X52 @ 1.50 but now just to get in to Windows with x50 I need in excess of 1.55+.
At first I was thinking it was the motherboard or BIOS and I'm still contemplating this as I was able to do x52 with no problems on an ASUS board before switching to the UD7. If I had another mobo on hand I would give the chip a shot in that but I don't so RMA to Intel.
Time to go back to ol'reliable X58 until I get another chip.

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