If you go for the HD 48XX series cards a word of warning, these get
very hot, I purchased the HIS IceQ version & still runs hot, the latest cat version 9.10 ccc has a manual overide for the fan speed, I reccomend setting this to 80%.

A better alternative will be ATI Tray tools, can do away with ccc, the new beta version is available & works
very well with controlling the fan, a must have!
http://cid-a50350ea7a969f0c.skydrive...c/attsetup.exe