BF3 Low FPS GPU/CPU Usage 60/80

[JollyGreen]

Hello, I've referenced this site in the past a bit but this is my first post here and I'd like to thank everyone in advance for any help they can offer. My problem is that online in BF3 multiplayer my fps is dropping to 20-30fps while outside on larger maps and there is fighting going on. I should mention that I play with the in-game stereoscopic 3D turned on on a 120hz Acer projector, so I believe that fps is per eye. Also turning the settings down to low only results in maybe a 5fps increase. While playing I have tabbed out into speedfan and catalyst to see if I can figure out what is causing the slow down and have found that the gpu usage never goes above 60% the entire time while the cpu usage never goes above 80-90%. I have noticed though that a pair of the four cores will max out during the fps slow downs. Mainly it is the first two cores that max out. My question is is this a cpu bottleneck causing the slow downs or something else. My specs are as follows

AsRock 970 Extreme3
AMD Phenom II x4 965BE oc'd @4.1 gHZ
XFX Radeon HD7870 BE with stock oc
8GB Corsair XMS3 DDR3 RAM
Eagle VoltasX 600W PSU

 

[JollyGreen]

I forgot to mention I play the game at 1024x768 120hz.