I plan to upgrade my Dell Studio XPS 435MT with a new Nvidia GeForce GTX 760 graphics card. My motherboard only has a PCI Express x16 2.0 slot and the 760 is a 3.0, but it will still work, am I correct? Apart from that, I need to upgrade my power supply as the current one is inadequate. Could someone recommend a decent enough power supply that won't be to expensive? Thanks for the help.