Windows 7: hardware bsod

hi, my computer that I built started to crash frequently and this is the first time It has given me a mini dump. I ran some tests and found that my ram and hard drives are fine judging by the .dmp file id say it is either the graphics card or the possessor but I wanted another opinion thanks in advance

Dump indicates 0x124, a hardware issue Stop 0x124 - what it means and what to try