So I'm looking to upgrade from a 2008 black macbook. For those who have the 5K iMac. Assuming I'm not concerned with the fan noise and GPU heat as I will just use steam in home streaming for games. Using the 4.0 GHz i7 and using a fan control application to drive up the fans to 100% and some CPU benchmarking to stress test the CPU, would you still encounter thermal throttling on the CPU? and by how much? It could also be done on a 3.5 GHz i7 but I'd prefer to see results with the more expensive one. Also any chance that someone knows the maximum decibels of the noise that the fan would make?