magmgarcia :
I think your cpu will rest a little with the gpu, because the gpu also has cpu, you try to clean your pc(cooler,motheroards,cpu,fans) if the weather is very hot then it affect your pc.
The first part of your answer makes no sense. No GPUs do not have a CPU in them.
prince_xaine :
Nah, your CPU shouldn't overheat. Best way to tell, download real temp and cinebench and push it to it's limit while monitoring the temps. Most games won't push the CPU that far if you have the graphics up high enough to where most the load is handled by the GPU. In my opinion, you can't really make it any worse by adding a GPU. As long as your CPU stays under 80C I'd say you're fine. (Higher than this is technically fine too, but not really recommended)
Tmax on most C2Qs is 71C not 80, the fact he is running 65 degrees at 40% load is not good, telling him to go to 80+ is REALLY BAD. His CPU is ancient in gaming terms, and some even light recent games will push it all the way. Hes likely not playing anything that really pushes it because he doesn't have a GPU, but depending what he buys and what he tries to play it can very well push it too far. Your generalization is very incorrect, there are plenty of games out there that have no problem fully loading the CPU (ie strategy games, games with a lot of background units, etc) no matter the graphic level.
Based on its age he needs to replace the thermal paste at minimum, a new cooler will help too if only because his stock one is probably just tired. Bearings wear out, dry out, etc.