it's certainly up to him.
now he has a opposite opinion - not to buy a new CPU. Because a "low cpu usage" isnt a sign for a CPU bottleneck.

Hi clement78, dont listen to the nonsense these guys talking. Your issue has another reason. You both even understand the question ?? Your CPU is the problem, at 3.2 GHz it does not feed data quickly enough to the GPU to make any difference. Definitely CPU bound. You should be off the fps scale with...