Spent some time on the reasons why i needed a lot of NB volts.

Firstly With the OCZ 8500 SLI memory I found that I had one dud stick in the 4 1GB modules. But even using the two good ones in Dual Channel i got lockups, These reduced with nore NB volts but were always there - Even if running the ram at stock, or under clocked at 800.

Interestingly running each stick as a single module (no dual channel) windows was perfectly stable. As soon as two sticks went in Dual Channel i got lock ups.

Anyway, i have returned the SLI for a refund and put in my trusty OCZ Rev 2 Plat 6400 at 800 4,4,4,15 and no more lockups - NB volts as sugested at 1.48 and nice and stable.

Conclusion... Either the OCZ 8500 SLI chips I had were all bad or the DFI board just does not get on with these chips.

Out of interest - in these changes I had to reset the CMOS and did it by removing the battery. In all the changes I now have a re occurence of my USB keyboard flashing num lock light and system pauses. I need to iron this out, it could be... reset cmos issue by remove battery, moved GPU from Slot1 (nearest NB) to Slot 2(next one up) or the change of RAM. At the moment my best guess is the movement of the graphics card because it seems to be grahics related.