Thanks guys, but I don't think the graphics cards are the problem as they run at 30Degrees when Idling. Obviously they don't get used when priming. You'll also notice my loop goes through to my Radiator and then straight to my CPU for max cooling performance for the only overclocked item (i.e. the cpu - I dont overclock my graphics cards).

I'm sure this board requires more voltage than usual and still finding it VERY fiddly to get stable with anything above 4.6ghz. This is my first Intel chip in a long time - I'm great with overclockign AMD stuff, but not good with overclocking intel especially SB stuff! Any pointers more than welcome.

@@ Martin V.R. - Any chance you could post the settings you are using for your sons setup please? thanks.