I'm really not sure what the problem is, but for example that CPU is about the equal of an Intel i3. I had an i3-3225 and an AMD Radeon 7850 which would be just a little slower at stock than the 760, and I have it like way overclocked. In terms of frequencies its 30% faster than its supposed to be. With that setup I maxed out games like Bioshock Infinity.
With a similar CPU and GPU, your should be getting about like I do. I haven't played Far cry 3, but I'm positive if I did I would have the settings maxed. Only games I haven't been able to max in that setup are Tom Raider, but that was when I only had overclocked by about 15% and I still ran it on High settings just not ultra, and Shogun II (most CPU intense game made).
Anyways I hope you can see my point with this, that it just doesn't make sense you would get capped so low. Please both of you try a CPU monitor and report back your CPU usage so we can determine if it is the CPU.