This evening I took my nF4 SLI-DR chipset cooler off. The factory paste had dried and come away from the chip causing it to overheat.
A complete removal of the old paste with TIM-cleaner, sanded down the back of the chipset HSF to be smooth, cleaned it then applied AS5.
The temps are now a steady 43degC idle and 46degC under load. Whereas before it would be 46-48 idle but would cause lock ups.
cpu 30degC, pwmic 34degC and chipset 43degC.