before i had e 350W PSU ,i dont know which firm was ,my graphic card is GT 8800 1GB ,and with 350W my computer sometime shutdown but i was able to play GTA IV on Very high setting without laging ,now after i upgrade PSU to AcBel 460W with these spec: 13.0A ,17.0A,16.0A etc,, and max with 12.0V ,i can't play GTA 4 on very high setting because FPS go to 22 ,max 30 ,i dont know where is problem ,i think maybe on PSU ?