I thought I would treat myself to another overclocking session.
I have worked some good information out about this board at least.
I set the overvoltage jumper on the motherboard as max without it was 1.55V (BIOS setting) Actual 1.408-1.42V under load Vcore.
The CPU VID was'nt showing up in AIDA 64 until I set this Jumper, now it shows up just fine, and it lets you into the secret of this board and its V droop.
Set 1.6V in BIOS and you get 1.5V CPU VID in AIDA 64. exactly 0.1V less than set value.
Ok, because the chip is not BSODing when it is above 4Ghz, there is only one thing that i can deduce, and it is this, Intel Burn Test is well known for maxing out the CPU and getting it hotter than any other software, included, in my experience, Prime 95, I find that even a four hour run of Prime 95 will result in temperatures around 5-7C lower than Intel Burn Test produces when running the tests higher than standard.
So I am pretty sure that its basically temperatures that are holding this CPU back now, Pretty much as soon as Core Temp exceeds 55C Intel Burn Test fails.
I have however given it a little further push:
OK, 4.02GHZ Nice and stable.
CPU: 4.02Ghz @ 1.45V (Vcore under load) 1.575V (BIOS) 1.475V (CPU VID) AMD X6 1090T Thuban Black Edition
CPU/NB: 3128Mhz @ 1.45V (Auto in BIOS)
HT: 223Mhz (222 BIOS)
HT link: 2230Mhz
RAM: 1786Mhz (1.66V) (AUTO in BIOS) @ 8-8-8-24-36 1T 2x4GB (8GB) Crucial Tactical Tracers (1600Mhz rated)