Hey guys, I recently recieved a Nvidia Geforce 8400GS 512 mb as a gift. I have a dell vostro 400 with 3 gig ram and a Geforce 8300GS 128mb. The PSU in the dell isnt very powerful, i think its 300 watt. I narrowed down the choices to a ATI Radeon HD 4350 and a EVGA Geforce 9400gt. Both are 512mb...