...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....
I just upgraded a Samsung R20 to Windows 7, it has a ATI Radeon Xpress 1250. The display was fuzzy with Windows 7's default display driver. I went to AMD's site (ATI ,merged with ATi)
...The laptop manufacturer is the exclusive provider of driver updates. If the required driver update is not available at the laptop manufacturers’ website, it is recommended to contact the manufacturer directly, to see if an updated driver will be made available in the future... AMD cannot provide driver updates directly from AMD.com...
So I want to Samsung, but no luck, it only got XP and Vista.
I remember when I run Win 7 upgrade adviser, it suggested me to got something like 1300 (I should pay better attention the first time)
So I go back to AMD, and search for x1300, no plan for Windows 7 driver but y Catalyst Software Suite 9.11(older version such 9.3 crashed in Windows 7) seem OK to me.