OCing the GPU doesn't matter if it's in an OEM or Customized built PC.
As you're only OCing via software which is done pretty easy with eyes closed.
Also, he said
can't overclock this CPU because it's an OEM build from HP.
I tried overclocking it from 850 to 950 mhz, raised the voltage from 1000 to 1025 mV and the Piece of *** blue screened. The temps are fine and I get great airflow with all my extra fans. Excude my language, but i'm reading clocks of well over 1 ghz or at 1 ghz on here. It's too late to take it back now, so I just have to suck it up I guess. It's alright for what I'm trying to do. Even though this junk artifacts all the time.
(That's mostly a rant, I appologize. I just tested for artifacts on ATITool, and it blue screens. It makes me really angry.)