Don't know if it's Vdimm or Vtt ( Vqpi ) related but I think I've lost 1 channel of the DDR3 controller in my first i7 920 C0 retail CPU
I say I think because I'm not entirely sure that the CPU is damaged, it could be the board, and it could also be a bent socket pin ( planning to check it out tomorrow ).
I shall update this post once I have done my research and have a conclusion and autopsy report ready