Right a final note.

The soltek board is unstable at any FSB over 156mhz. Its not the cpu thats crapping out, its the memory. Running 1:1 with lowest timings it fails memtest. The strange thing is it boots all the way up to 166mhz. Can also boot at asynch mem speeds, always get the same errors though. Its no more unstable with mem @ 4:5 and 3:4 using 157fsb than it is at 1:1. Definitely the board. The chipset gets seriously hot - burning hot in fact. Its warm enough that you can smell the heat coming off the board. Id be tempted to try cooling it better, but in all honesty I really cant be bothered to mod a board just to get it to run at stock speeds (should be 166mhz capable - the chipset certainly is).

This board is a dog - avoid at all costs.

PiLsY.