Tried F6 final bios and had lock ups and friezes in windows at 4.0Ghz. Have now tried F6x and found it to be better - anybody else found the same?
So far stable in Linx - only ten run need to test more I know, plus prime overnight once I am happy I think it is totally stable.

Think I will try 200x20 with turbo off to reduce temps and v core a bit more as that worked well when I tested at 3.8. Temps for above 4Ghz run were 70 to 76 degrees under water.

Mark