Quote Originally Posted by CryptiK View Post
Found it. Can't believe it took this long. The C1 ram slot or signal path is damaged. It wont boot at all when overclocked with a stick in that slot alone, boots occasionally with 3 sticks in but rarely loads windows, and I get erratic boot errors when running stock speeds with that slot populated (eg: bootmgr is corrupt or missing etc).

Board will be exchanged for another. Hope the next one works!

Thanks for the advice guys, nice to have people to bounce ideas off
When you get your return board, run it without the full cover block (use the stock sink) for a few days first. The if everything is a-ok use the block, making sure not to go too tight.