After having the 5870 installed for a couple days now, I have decided that it's a little louder than the 4870 was. I think I'm going to pop the side off and try the old "finger-on-the-fan" trick to verify it's the actual GPU fan that got louder, and not some dust bunny or something stuck in one of the other fans during the install. Also, the 5870 is definitely faster, but it doesn't blow my mind or anything. I probably should have replaced my brake pads and rotors before getting this card... or not. I suppose squeezing a little more life out of the brakes isn't a bad thing. I dunno. I guess I wasn't realistic in my expectations of a card that's "twice as fast / powerful." The 4870 is a pretty nice card, after all. Anyone else who switched from a 4870 feeling ho-hum like I am about it?