Hi guys! I think it's time to upgrade my machine and i saw this really good and cheap AMD Radeon 7770 but i only have a 300W PSU! I have an i5 Quadcore 3.00GHz CPU and a Nvidia GeForce GT 530. I also saw the AMD XFX Radeon 7750 wich only needs the power from the PCI slot! I don't really plan on upgrading the PSU but i will if necessary to install the 7770. What do you guys think? Thanks for your time!