In the last few days my system has developed some instability, I can't think what's causing it and I'm looking for suggestions.
It seems to be fairly random whether it'll BSOD or just reboot when doing something demanding. I've had it point at ntoskrnl.exe, dxgmm1.sys and ntfs.sys, which seems reasonably inconclusive.
I did think it was just 3D games, until I managed to get Intel burn test (very high, not normal) to crash it (pointing at ntfs.sys). Planetside2, Path of Exile and Guild Wars 2 have a managed to crash it, seemingly at random amounts of time, but you've got to be running it for a little while (no instant crashes), and GW2 did a crash the moment I headed through a gate to load another zone. As far as AMD drivers go, I've had it crash with 13.1 WHQL and 13.2 b7.
memtest didn't pick up an error after letting it run for 30m/2 cycles, although that's more a case where it's able to prove a fault rather than give something a clean bill of health (you could run it for 100 cycles and it'll fail on the 101st). Monitoring/logging with hwinfo hasn't shown anything suspicious, no high temperatures or wandering voltages before a crash.
I'm probably going to crack the case next and try reseating some things.