We've recently become aware that playing Diablo III with the latest Catalyst 12.4 drivers for ATI cards may cause some visual artifacts for specific hardware configurations. This issue affects users of ATI Radeon HD 2400, 2600, 2900, 3400, 3600 and 4500 graphics cards under Windows Vista and Windows 7. ATI Radeon HD 4600, 4700, 4800, 5000, 6000 and 7000 series products are unaffected, as is Windows XP.

If you are using an affected card you may receive a warning from the game stating your video card is unsupported. This message can be bypassed by hitting the escape key, but you may experience issues when playing with these cards.

Update: ATI has released a Catalyst 12.4b driver hotfix for the affected cards.

Please check this link for more information:

http://support.amd.com/us/kbarticles/Pages/AMDCatalyst124bhotfix.aspx
Edited by Velnrak on 5/28/2012 11:09 AM PDT