Question about CPU, GPU and Motherboard compatibility.

Hey everyone, I currently am running a decent rig. It runs most games at mid to high settings. I can run games like WoW at Ultra with about 50-60 fps. Though I've been playing BF3 quite a bit as of late and it's only playable at low settings (which I still fluctuate anywhere between 20-45 fps). Anyway, I'm just thinking that it's about time to upgrade and I was already looking at a few parts.

These are the parts I have currently:

Motherboard: nForce 780i SLI
GPU: GeForce GTX 285
CPU: Intel Core 2 Duo, 3.00 ghz

The parts I'm looking to get (hopefully without replacing the motherboard):

GPU: GeForce GTX 660 3GB FTW Sig2 / GeForce GTX 660 Ti FTW
CPU: I'm actually not quite sure and this is where my question comes in. Will my motherboard only be compatible with Intel CPU's? Or can I go with an AMD? I just want to grab something that won't bottleneck my GPU too bad or at all. As you can tell, I'm really looking to make a pretty big jump in regards to an upgrade.

Will these parts even be compatible with my current motherboard? As well, can nForce 780i SLI's support DDR3? I can't seem to get a straight answer. Some say absolutely not, some say it should.

Thanks a bunch for your time!
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More about question cpu gpu motherboard compatibility
  1. First it's socket 775, Intel, so would need an appropriate CPU like the Q9650, Q9550, etc, you don't list the mobo manufacturer (i.e. XFX, EVGA, Asus, etc, could be a straight nVidia, but go to the manufacturers site and it will have a list of all compatible CPUs (or should) hand I think there was 1 mobo that could use either 4 sticks of DDR2 or 2 of DDR3, but don't remember for sure, most all took straight DDR2 in 800, a few up to 1066
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