I dont have time to answer you all this morning but here are some answers:
Windows tested memory and came back no errors.
PSU is brand new and 680 Watt.
The Ramm came with the board. I think its unlikely but not impossible they sent the wrong RAM.
Ok something just kept drawining me to the fact it said 2 cores... Even though everywhere else on the system it said 4 cores. So I pressed 4 on boot up... My PC died.
...And then came back - with 4 cores @4.2Ghz
I was walking around with 2 cores this whole time running everything fine except the odd BSOD. Why the F&^%! do I have to press a button on boot up to open the other cores?! What a S$%^ load of F$%^. If I press it again next time can I have 6 cores?
Ok lets see what happens.