i suspect they might be using gddr5. gddr4 runs hotter and i hear it isnt really all that much better. gddr5 is suppose to be much better. i read a while back in jan that gddr5 was being sent to nvidia and ati for testing.
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[Windows Vista Ultimate x64][Intel E8400@3.8ghz] [DDR2 4gb] [Nvidia EVGA Gtx 260(711/1533/2432)
] [Creative Soundblaster] [Corsair 550w]
Lenovo X200Tablet: (L9400 @1.86ghz)(Intel GMA 4500MHD)(2gb Ram)(160GB 7200rpm)(LED-lit Touchscreen)