Dear frustrated PC builders! Motherboard manufactures have to comply with FCC regulations to sell products that do not cause ElectroMagnetic Interference EMI to other electronic equipment. In this sense Spread Spectrum was invented. This increases they chances to comply with the FCC regulations. However, to the average computer user this simply means that clock signals and/or other signals from/to the chipset are degraded in quality. This can (and have in my case) cause crashes at totally random times. Switching off Spread Spectrum in the BIOS solved in my case the problem on a ASRock P4i65G motherboard. I think it will be worth trying if you have the same problem, and I don't think the solution is limited to the ASRock P4i65G. Further on the ASRock P4i65G. The motherboard (and Intel 865G chipset) can decently communicate with Kingston HyperX memories at the maximum speed (DDR400). I have the KHX3200A/1G and KHX3200/512 modules. I ran memtest86 overnight without any problems to back my statement. Good luck!
