This is the process explorer screenshot from when the crash occurs:
I have been having these crashes during games (quickly in minecraft, after a long while in most other games) for quite a while but haven't really done anything about it because I don't game that much anymore.
Timeline for crashes:
Launch game
Enter level
Crash
Not doing anything special in particular. Minecraft is completely vanilla on normal range and crashes happen after ~45 seconds max. GPU isn't overheating. Having looked at temps during the same crash in the past my GPU was most likely around 40 Celcius.
I have no idea what to do
GPU is an ancient 4850
CPU: Intel Core 2 Duo E6750 @ 2.66GHz
MoBo: Gigabyte P35-DS3L (Socket 775)