I recently got a Powermac G5 quad. I have moved my gfx card, RAM and SSD from my dual core 2.3 PM G5. The dual core will going to be my spare. I have observed that the CPU fans on the quad turns much faster than on a dual core. My question is that my backside temperature is hovering around 121F and the backside fans were at 1600rpm. Is it normal? If it is not normal, where is the heat coming from? And the noise level is much higher than my dual core.