While the Radeon x1900GT is based on the R580 GPU, it’s clock speed has been reduced as well as the number of shaders and pipelines.  HotHardware tests this ATI mid-range card against nVidia’s to see who offers the best value.
“We’ve just posted a review at HotHardware of Sapphire’s Radeon X1900 GT. This card sports a trimmed-down version of ATI’s R580 GPU and 256MB of high speed Samsung GDDR3 RAM. It’s also got a few other niceties thrown in for good measure. Head on over and check it out…”

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