Zkus: Ovládací panely\Systém a zabezpečení\Nástroje pro správu\Diagnostika paměti Windows (nebo použij jiný soft na otestování RAM).
47° C na grafice není žádný problém, pokud dál neroste nad 70-80° C.

Pokud to nebudou paměti, projdi Googlem tohle:

On Thu 1.11.2012 21:50:59 GMT your computer crashed
crash dump file: C:\Windows\Minidump\110112-24875-01.dmp
uptime: 03:26:04
This was probably caused by the following module: Unknown (0xFFFFFFFF82D17DBC)
Bugcheck code: 0x116 (0xFFFFFFFF851841F8, 0xFFFFFFFF922C1BC6, 0xFFFFFFFFC000009A, 0x4)
Error: VIDEO_TDR_ERROR
Bug check description: This indicates that an attempt to reset the display driver and recover from a timeout failed.
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: Unknown .
Google query: Unknown VIDEO_TDR_ERROR