Corbin123 :
The game i am wanting to play is DarkFall UnholyWars... Need moderate fps for pvp. Just dont want to pay 1200 for a new comp if i don't have to
Hi Corbin, if your Mobo is based on the 760g chipset then it must be an AM3 board and so will support one of AMD's quad and possibly hex core cpus from the Phenom II range. First thing to do is identify the motherboard make and model (best way to do this is open up the case, there should be a model number in bold somewhere near the CPU). Go to the manufacturers website and look up the CPU support list. Note some cheaper boards may only support CPU's up to 95W which is why it's important to check first.
For modern games you need a quad core chip, there are quite a few that should work even if it is a 95W mobo. As Eagle said you need a better power supply (I'm assuming the one you have will be a generic 400W supply). I'd strongly recommend getting a branded PSU like Coolermaster, as the OEM models are usually pretty bad. Ideally for supporting a good graphics card you want something with at least 32A on the 12V rail (note NOT 2 x 16A rails). As for the graphics card- if you want to keep costs down the 7850 1 Gb model is really good value, as is the newly released 7790 (should be available in a couple of weeks). Both of these cards are enough to game at 1080p with decent settings and 50fps average in almost any game. The 7870 cards and above are best suited for very high resolution screens / multi monitors or very high levels of AA. The other thing you need to check is that the mother board has a PCIE x16 slot for the graphics card (most boards do, however if its a branded system e.g. from Dell or HP, I have come across boards in the past without a graphics card slot- usually for small form factor machines).
If you need some more help, list the make and model of your motherboard, and a budget for parts and I could give you some more specific options.