I have been experiencing stuttering and some hang ups in almost all games and i'm beginning to think it might be my power supply. I tested with each stick of ram individually and that didn't help. I checked all my temps and they all seemed acceptable but i added another fan anyways and that didn't help. I've removed all unnecessary processes, defragged, and ran antivirus. By the recommendation of a friend i tried underclocking my cpu, graphics card, and ram separately as well as overclocking slightly. I have had no luck with any of these options.
Is it possible that my power supply is causing this stuttering?
If so what wattage power supply would i need and is there anything in particular i should watch for when im shopping.
PSU: 550 watts
GPU: ati radeon hd 5770
CPU: amd phenom ii x4 925 2.8ghz
RAM: 4gbs ddr3 (2 sticks 2gb each)
HDD: 1tb 7200 rpm