I've got a 7800GT in my PowerMac and if it were not for this card my machine would be almost whisper quiet. My Computer was not this noisy when I first got it with the 7800GT included. I am certain it is the GPU fan because if I stop the fan with my finger the Computer becomes whisper quiet. The card never made this much noise before and it seems that the Fan on it is always running at Full speed regardless of what I'm doing. Okay so what I'm wondering is if there is a way to quiet the GPU fan down a bit? I know that the other Fans are controlled by software but is this true for the GPU fan as well? or does it have a mind of it's own. I have been monitoring the temperature of the GPU and it seems fine running at 125-150 degrees fahrenheit which is what it ran at before getting so noisy. The fan just seems to want to run at full throttle. So far I have tried cleaning the card of Dust. Resetting the PMU. Booted from a Second HD with clean OSX install and still the same the Fan still runs at a monotonous full throttle never wavering. I have read elsewhere that the Fan has two speeds but mine seems to only want to run at High speed. Is there anything that I can do besides ripping off the stock heatsink/fan and replacing it with an after market solution?