clutchc said:
Definetly do not try to run a GTX 670 with that PSU. That is a very low end PSU. It's 500W rating is bogus. With 2 x +12V rails rated at 15A and 16A it is basically a 350W PSU. And a poor grade one at that. According to this ad, it doesn't even have a PCIe 6 pin connector for a GFX card.
http://www.internetct.co.uk/500wwinpowerquietpsupowersu...
The GTX 670 requires 2 x 6 pin PCIe power connectors. It requires 170W maxed out which means it will draw over 14A from the +12V rail
http://www.hwcompare.com/12500/geforce-gtx-670/
I have done a lot of reading on PSUs and realise that my question was pretty stupid, I changed the first post to reflect that. Am am however still not 100% confident on selecting a power supply by myself. I had a look around and found the Corsair HX Series HX750 750w has really good reviews, and is pretty efficient. It looks like it would be fine and definitely suit expansion. Should I get this?