Xeon E3-1245 3.3ghz bottlenecking GTX 670?

Hello,

2 weeks ago I upgraded from a GTX 560TI to an Asus GTX 670 in order to play Far Cry 3 on high-ultra.

While the upgrade definitely improved performance.. (going from medium @ 35fps to high @ 60fps) the upgrade is not as good as I expected. Textures and rendering is horrid and not what I see when I watch youtube videos of people playing Far Cry 3 @ 1080p on a GTX 670 on high settings. Also I can barely OC my 670 to 1150 Mhz boost.

So do you think a CPU upgrade is needed?

For a bit more detail, I am playing with MSAA off; Direct X 11; High Settings; HDAO enabled.
I have an Antec Elevenhundred case loaded up with fans with 2 Corsair AF120 on the side panel.

Thanks in advance.