Quote: Originally Posted by vpro
Thanks for your help but I'm not really into that hardware stuff and i didn't build this computer so I'm not sure how the power supply works.
I attached a picture so you can take a look at it.
Will i need to buy a new power supply in order to handle a better graphics card?
Interesting. I can't make it out, but from what I can see it looks more like each card has a real PCI-E power connector, rather than one using a Molex to PCI-E adapter. Are you quite sure that the PSU is the Inter-Tech FP 750W? (Care to show us a picture of the label on the side of the PSU? There's a small bit of the label visible in the upper right of your snapshot.) Maybe the PSU is a better one than the one in your spec list.
If you wanted to use a Radeon 7970, you'd need one 6 pin PCI-E power connector, plus one 8 pin (often a 6+2 pin, that can be used as either 6 or 8). A GTX 680 would need two 6 pin PCI-E connectors.
Incidentally, your hard drives are SATA (3Gb/s, sometimes called SATA II). The black SATA cables don't show up well in the photo.