I set the mem up in bios to match the specs of the ram. 800MHz at 2.0v. I tried 667MHz and a dozen different timings and speeds with different voltages. I don't have another computer that I can try it on (my main computer runs on ddr3, not ddr2) when I originally got the errors, I was going to just replace the ram. But when I tried each chip individually and they passed (and on different sockets) just so long as I don't run both sets. I do have the NB voltage set to "auto"... Should I up that voltage?