Round 4 trial fit, 90 percent better fit than last time........ If it were a no compramize situation, I'd be lapping the CPU installed in a motherboard, so that it is flat when clamped down!!!! sort of like cylinder honing torque plates. There's visible deflection in the heatspreader where it get's pressed on by the lga775 socket's clamp.. I can't get away with an ultra thin application of as5 the way it is, but I did re-work the heatsink base very slightly on the edges that had the most squish-out.

I applied a thicker layer of as5 this time..

It's been idling at 49c with windows xp runing; used to idle at 54+ in windows.. Idles at 37c in the bios; used to idle at 48 to 50c in the bios.

Gotta do some load testing... to be continued.......