Core i5 2500k 09c BSOD only on cold boot

Recently I began experiencing an infrequent 09c bsod only on a cold boot (its not every cold boot). I know that generally 09c is QPI / VTT.
my VTT is currently set at 1.077. Because this only occurs infrequently, and only on cold boots, testing and fixing this will be some what difficult.

Has anyone else experienced anything like this? Anyone have recommendations?

some relevant info:
Current 24/7 OC 4.5ghz (24hrs prime stable) offset voltage
Ram frequency: 1866
Ram timings: CL 9.0 tRCD 10 tRP 9 tRAS 28
DRAM voltage: 1.5
VTT voltage: 1.077
VCCSA voltage: .925v
PLL voltage: 1.791
PCH voltage: 1.059
Vcore voltage under load: 1.328 - 1.344

Could you elaborate on what makes you think it would be Vcore? To me that seems kind of odd if I am 24 hrs prime stable with 95% ram in use.

I guess at this point, I'll just step up the VTT and see if that fixes it.

A few updates:

I've done the following:
A) I removed the CMOS battery, unplugged the power supply, and then held down the power button for 15minutes. Rebooted and things seemed to be fine for my next couple of cold boots. The problem then reared its ugly head again.

B) I began to suspect that maybe there was problems with some sort of driver or software so I went to reinstall windows. I placed my windows cd in my drive and attempted to boot from cd. After the cd unpacked it self, and began to boot windows I encountered the 09c bsod / machine check error once again.

This lead me to believe that it was probably hardware or OC related. So I proceeded to do the following:

1) I dropped the memory settings to below its XMP profile, down to 1600. Tried to boot from CD, bsod 09c machine check error.

2) I turned the memory xmp settings back on, back to 1866. I dropped all cpu overclocks/voltages back to stock. Tried to boot from cd. NO bsod.

I had overclocked my cpu from 3.3ghz to 4.5ghz. To check stability I ran a 24 hr custom prime 95 blend with 96% of my ram used. I passed this with no problem. I then did 20 passes of linx; passed with no problems. I then did 10 passes IBT with 90% ram used; no problems. This lead me to believe my overclock should be 100% stable. However, after repeatedly encountering this error I believe that either I have piece of faulty hardware, my chip has rapidly degraded (unlikely), or I am failing to recognize some missed setting.

Below are screen shots of my bios settings and recommendations or thoughts would be appreciated.
Warning: Spoiler! (Click to show)

After the computer has been off over night or a few hours the bsod occurs just after the windows logo comes up. In the case of booting from the cd, it also occurs when the logo comes up (after the cd has fully unpacked / the white loading bar is gone). There is no Dr Debug Error when this bsod occurs. If I have been on my computer for a few hours and just restart it I do not encounter it.

I have 2 sticks of ram. I had mem tested them when I first built the computer for a few hrs and they had both passed at the time. I have not tested them since, but I am open to doing so.

Increasing the VTT from default (1.05) to 1.10 has had no noticeable affect so far. When I get home from work (5 hrs from now) I will try upping the VTT further and will also look for a new version of my bios.

This whole issue has been somewhat of an enigma, thanks for taking the time, I rather not have to deal with RMAs if I dont have to.