I didn't say cpu was bottlenecking. I said it was close to and I was surprised by it. I also said that this was specially happening with GTA V and Far Cry 4.
In another case (don't laugh please), it was a C2D with 3GB RAM and a HD 6570 (vram and gpu both OCed until reaching Afterburner's unofficial OC limit). I could run GTA V at 20-25 FPS but never dipping below 20. The resolution was 1366x768; funny thing is that even with 800x600 res, I could not gain 30FPS. Then, I discovered the CPU & RAM bottleneck for the first time. CPU was at 100%, RAM was at 2.5-2.8GB, but the gpu was at 70% highest.

Seriously, before that, I thought CPU can only bottleneck if someone uses a 980Ti with a core i3. But, that meager 6570 achieved 25-35FPS in a i7 with 8GB ram (same graphical settings).
[
Please, don't ask me how that machine ran GTA V, I can only say it is still running and the game has been finished twice till now...]
And, it was a clean install with defender turned off. So, I think my stupid OS was hogging all the resources; should've used Linux.
