I recently built a new computer and transfered my ATI 9800 AIW PRO from my old system to the new one. The issue is that I could't set the eye candy to high without it developing artifacts on my old system. I thought the video card was defective.. So when I used it on the new system and cranked the eye candy to max and everything worked perfectly..
Video card: ATI Radeon 9800 AIW PRO (Stock speed)
Athlon 1900+ Palmino core (Stock speed)
1.5gb PC2600 ram
ASROCK 939 Dual- SATA2
Athlon 3000+ Vience core @ 9x270 (2.44 GHZ)
1gb PC3200 ram
Both use same kind of case with 2x 25x120mm Sunon fan