It's a PowerVR SGX design, by 'Imagination Technologies'. It's the same exact sort of thing that is giving Linux fits on hardware.
Remember the Nokia N800 and N810? Those types of chips were so troublesome that those tablets used no acceleration at all!
The old Intel 8xx series 'Extreme 3D Blaster' type devices used some PowerVR licensed stuff, I think, but I have no idea how much. The GMA series, up until the GMA 500 and whatever Intel is using in Moorestown, were pure Intel design.
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