AMD的原文是這個吧：
Note: AMD's DirectX 9 ATI Radeon graphics accelerators are not officially supported under Windows 7. If the user chooses to, they can install the ATI Catalyst Windows Vista graphics driver under Windows 7. Please be aware that none of the new Windows 7 graphics driver (WDDM 1.1) features are supported (as the Windows Vista level graphics driver is limited to WDDM 1.0 level support). Using the ATI Catalyst Windows Vista driver under Windows 7 is not officially supported by AMD, and as such AMD will not provide any form of customer support for users running in this configuration

AMD的DX9顯卡沒有win7的官方驅動，AMD建議使用win7的話可以安裝vista的驅動，但不提供vista驅動在win7下的客戶支持。