Pulled apart the cooling on the board and soldered on some volt read points.
See pictures below.
It appears that leaving PLL set to auto results in huge volts pumping into the CPU PLL when running high FSB, at 560MHz im reading 1.89V.
Turned it down in BIOS to 1.6V set (1.63V reading) and its stable just the same, so it seems too much PLL being set by BIOS at the moment.
Im not a big fan of heatpipe assemblies, so i took an old P35 cooling system, chopped off the heatpipes, and stuck them onto this P45 board
SB heatsink needed slight modification to the mount holes, seems about 1-2mm wider spaced holes than the P35 boards.
