The Nvidia GeForce GTX 480 is not even available yet, and we already have Atomic magazine pulling it apart to see what is in it. The memory chips are Samsung GDDR5 chips with the laser etching of KNG10325FF for the model number. To cool the GF100 chip, Nvidia is using a fan made by Delta Electronics that uses 21.6 Watts of power. While Delta fans are known to be loud, I suspect that Nvidia will not be running the fan at full load. Atomic magazine has 24 pictures available for viewing at the site linked below. From their on-line article:

The GTX480’s reference heatsink is unique compared to a huge array of more common designs; first and foremost due to its external radiator that vents heat directly off the surface of the card. While it still features a squirrel-cage intake fan at one end, and passes most of the air outside the rear of the chassis, this radiator hints at a heat load that is atypical of most high-end cards.

via NVIDIA GTX480 Disassembly Guide @ Atomic MPC.