Conclusive Thoughts
After testing 8 games using a multitude of Anti-Aliasing settings under both XP and Vista 64-bit we can finally make an informed conclusion on gaming with these high end cards.
Anti Aliasing Performance Scaling
We put all our results together for all games tested under both operating systems we can extract the following findings:
Going from 0xAA to 4xAA
- Geforce GTX 280 under XP: -19.1%
- Radeon HD 4870 X2 under XP: -23.1%
- Geforce GTX 280 under Vista: -21%
- Radeon HD 4870 X2 under Vista: -10.6%
For both cards under XP the drop is pretty much on par; under Vista the HD 4870 X2 shows a remarkable difference, as performance only drops by ~10% on average!
Going from 0xAA to 8xAA
- Geforce GTX 280 under XP: -26%
- Radeon HD 4870 X2 under XP: -25.8%
- Geforce GTX 280 under Vista: -28.7%
- Radeon HD 4870 X2 under Vista: -15.4%
When going from 0xAA to 8xAA the HD 4870 X2 is now better in both XP and Vista, under Vista the performance drop is still quite small, only ~15%! The GTX 280 drops by nearly double.
For those wondering if there next gaming machine should be running Windows XP or Windows Vista, the following numbers will be most interesting:
Performance Scaling XP to Vista
On average with the Geforce GTX 280 you lose -1.6% by switching to Vista 64-bit, so in short: same performance and no loss!
The Radeon HD 4870 X2 does even better, if we leave out the numbers of Stalker and Tomb Raider (as Crossfire failed to run properly under XP) we see a +5.8% boost in average FPS going from XP to Vista. If we add the two game titles and let them enjoy CF-scaling the number jumps up to +27.7%!
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