The biggest issue here is that it's not something that happens instantly nor can be verified right away from a cold state.

The MEMTEST has been going for some hours now (new run) and no errors have been reported yet. The memory modules are quite a bit hotter than when they're running normally in the system - just noting this by touch.

My PVR software is happily running on a different system right now, but I don't have access to all my previously recorded content because that's still siting on SATA drives in the original system. The spare machine has only PATA, so it's going to be handling only the record duties while I'm away and until I can get this memory stuff figured out.

Now I'm in a scramble to finish up all the other crap I need to do before leaving in the morning - which it turns out is more than I was anticipating. Scramble time.