ATI - Windows Vista SP1 Gaming Performance
(Longer bars indicate better performance)
System Setup: Intel Core 2 Extreme QX9775, Intel D5400XS, 4GB FB-DIMM (2x2GB), 750GB Seagate 7200.10 SATA Hard Disk Drive, Windows XP SP2, Windows Vista 32-bit, Windows Vista 32-bit SP1. Graphics Cards: Radeon HD 3870 512MB, Radeon HD 3870 X2 1GB. Graphics Drivers: ATI Catalyst 8.3.
Outside of 3DMark06, the single-GPU Radeon HD 3870 showed little sensitivity to the various operating systems. Windows Vista with Service Pack 1 has excellent performance, and is pretty much on par with Windows XP SP2 with the Radeon HD 3870. On the other hand, the Radeon HD 3870 X2 performed abysmally under Windows XP. We're chalking that up to immature drivers, as the video card is still on its first set of drivers.
Conclusion
Windows Vista with Service Pack 1 is a step in the right direction. Gaming performance increased in comparison to a fresh installation of Windows Vista. Windows XP SP2 provides better overall performance, and remains the place to go for dual-GPU solutions. Windows Vista is not quite the ideal gaming platform yet, but the new OS is getting close to dethroning Windows XP.
421 Comments
Windows Vista SP1 Gaming Performance Report
If you're going to install Service Pack 1 for Windows Vista, you might as well know how it affects your games.

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