What is the optimum temperature for a CPU or GPU during gaming?

We as a whole discussion about this a considerable amount, however, the appropriate response isn't constantly self-evident. At the point when you fabricate another PC, get every one of the bits in the correct spot, string up your wires and fly in your beautiful glossy GPU and CPUs, at that point flick that ON switch, you hold your breath. Will the PC fry itself for reasons unknown?

What temperature is the new PC's CPU and GPU....