ATI is preparing to release the 4th product based on its R580 architecture.
The single-slot Radeon X1900 GT, a cut-down version of the Radeon X1900 XTX is positioned to go head-to-head with NVIDIA's popular GeForce 7900 GT in performance and in price. Specs, 575MHz core, 600MHz (1.2GHz) memory, 36 pixel shaders and 256MB of DDR3 memory.
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Source: DailyTech