A few initial documents reveal that xGT300 has already passed the initial design phase and that alpha-stage dies have begun to tap out. The chip is different from the G80/G92/GT200 in several ways. First, the x in the name, it means multiple cores (think Larrabee to some extent).
The top-end piece has four cores, each with 64 shaders, 18 TMUs (each with 2 addressing & filling units), and 12 ROPS. This may not sound like much, but the system is designed such that it breaks the image down into four parts and renders each one separately. Oh, and the cores are going to run at well over a 1 ghz each with the shaders more than double that.
After taking a step back to a 256 bit bus with the 9800 GTX after the 8800's 384 bit bus. Well, the xGT300 is being prepped with a 512-bit bus and is expected to have its memory measured in gigabytes and not megabytes.
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