I just got my shiny, red Radeon today and figured I'd run through the benchmarks with my old card and it. The new card is better than I thought it would be:
System Specs
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Asus P5N-D Motherboard (nForce 750i)
Intel Core 2 Quad Q9300 (2.5 GHz)
2 x 2GB Corsair XMS2 DHX RAM (4-4-4-12)
Old Video Card: NVIDIA GeForce 9800GTX - 512MB GDDR3 (512-bit)
New Video Card: ATI Radeon HD 5830 - 1GB GDDR5 (256-bit)
3DMark Vantage Benchmarks (only GPU tests were performed)
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Preset: Entry (1024x768, no AA, no anisotropy)
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Old: 25651
New: 31615
Preset: Performance (1280x1024, no AA, no anisotropy)
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Old: 6040
New: 10786
Preset: High (1680x1050, 2x AA, 8x anisotropy)
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Old: 3813
New: 7797
Preset: Extreme (1920x1200, 4x AA, 16x anisotropy)
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Old: 2501
New: 5688
The card yielded surprisingly good framerates even on the "high" preset, ranging from just short of playable (~15fps) to quite playable (~45+), whereas my old card couldn't even manage that on "performance."
In particular, the 104.4% increase in the "high" preset and 127.4% increase in "extreme" pleased me.
Oh, and best of all, the drivers don't fucking suck like the Forceware 200 series. I didn't suddenly lose 1280x960 and lose the ability to change refresh rates on my CRT and the text doesn't look like complete shit on my secondary display anymore (don't know what the fuck NVIDIA did to cause that to happen). And finally, the best change of all is that aspect ratios are preserved in hardware on the new board. Even my initial boot screens show in a proper 4:3 ratio, even on my widescreen monitor. My NVIDIA card literally didn't do anything right in regards to that. I've actually seen it smash 1280x800 into a 4:3 ratio when it pumped it out to my monitor, necessitating me to change my refresh rate from "59hz" to 60hz...which doesn't make a lot of sense considering my monitor only supports the latter. Guess what? The ATI card got that little bit of autodetection right, too, and that's an issue that my 9800GTX and my 6600GT before that couldn't seem to get right.
Gotta love it. Oh well, time to play some games!