^ that's ridiculous !
If it turns out to be a psu issue a quality 650W is enough.
Crucial doesn't sell/make psu's and BFG is out of business.
Anyways more often then not that particular error is caused by unstable drivers.
In Add/remove dump the ATI install manager=everything
Download and install DriverSweeperhttp://phyxion.net/item/driver-sweeper.html
Run DS in safemode
Check off ATI
Analyze and clean
Install ATI 11.1 as ADMIN