Now I'm going to run the Prime95 for another 24 hours.

The ASUS mobo was running the RAM under-spec. It was using a clock of 399MHz (DDR2-800) instead of 533 (DDR2-1066) and the latency was 5-5-5-18 instead of 5-5-5-15.

If I set the mobo with Memory Frequency to AUTO, it will run 399MHz even though it's also set to use SPD. So I turned off SPD to set the latencies manually, set the clock manually and even set the voltage manually.

I'd really love to know if the SPD data is incorrect or if the mobo is simply not using it properly. Is anyone able to understand the output of the SPD tool sufficiently if I post it?