I have a gigabyte mobo(78LMT-S2P) running an AMD Athlon II x2 @ 3.1ghz.

Now not that I'm complaining or anything, maybe i am, ok i am. What upgrade can i make, more specifically which AMD PHENOM will this mobo take? I haven't the slightest clue where to start. My life with computers starts with GPU's and ends with RAM. When it comes to a CPU i have no clue. Any help would be greatly appreciated.

Check out the CPU Support List on the product page. Note that you may need a BIOS upgrade to support some of the processors on that list.

feel like the worlds biggest idiot, thanks heaps amp.