I want to upgrade my old graphics card but I don't want to have to swap out the PSU for something more powerful. Anyway, I'm not sure whether to get a GTX560ti (MSI TWIN FROZR II) or a GTX480 (with a zalman VF3000 cooler) and theres also the issue of whether or not i'll have enough juice to power either card. They both cost £140, so price isn't really a decider. My power supply is a Coolermaster GX-550W (it has 2 PCI power connectors). I know people say that the 480 is a faster card but it seems a bit outdated for a upgrade - I would really appreciate some help with this, thanks.