Hi all, I have a Dell Studio 540 with quad core Q9550 yorkfield at 2.83. 350 watt power supply. My computer came with an Nvidia 9800 GT 512 ram and the GPU recently burnt out. I absolutely do not want to upgrade power supply. Will adding a gtx650 or and amd 7750 be worth it? I have read alot about the older CPU's bottlenecking the system and will this be the case with my sytem? From what I have also read I may be able to go up to An AMD 7770, I do have the 6 pin adapter. Thank you.