CPU model / stepping / microcode versions are probably at least as useful as temperature. I'd also try to get things like the actual DRAM timing + voltage vs. what the XMP extensions (or similar) advertise the manufacturer tested the memory at.

I have at least one motherboard that just re-auto-overclocks itself into a flaky configuration if boot fails a few times in a row (which can happen due to loose power cords, or whatever).