They draw air in from the back. It's the same with my 8800GTS 512s, there's an opening to the rear of the cards and the fans draw air in through there.
My Computer
System One
-
- Manufacturer/Model
- Custom Built
- CPU
- Intel Core 2 Quad Q9550
- Motherboard
- XFX MB-750I-72P9 NF750i
- Memory
- 4096MB Corsair XMS2 PC-5400
- Graphics Card(s)
- ASUS Nvidia Geforce GTX470
- Sound Card
- ASUS Xonar DX
- Monitor(s) Displays
- Dell 24" S2409W & Dell 20" E207WFP
- Screen Resolution
- 1920x1080 & 1680x1050
- Hard Drives
- 750GB Western Digital Caviar Black & 500GB Samsung
- PSU
- 750 watt Thermaltake Toughpower
- Case
- Coolermaster Dominator 690 Nvidia Edition
- Cooling
- Zalman CNPS9700-NT Cooler, 6x 120mm Chassis Fans
- Keyboard
- Logitech G11 Keyboard
- Mouse
- Logitech G5 Laser Mouse (2007 edition)
- Internet Speed
- 100Mbps
- Other Info
- abit airpace 54mbps wireless PCI-E x1 card