I admit I haven't checked prices since I've had mine for a while. I assumed that G5s, being old computers, would be cheap. As far as noise, they are nowhere near as loud as the G4s. I didn't say they were quiet. I would never record with one in the room but I CAN stand to have the door to the computer closet open while I'm working. That is a HUGE difference. And the power is much, much more rewarding.