GDDR4 is much more expensive then either GDDR3 or even GDDR5, so ATI is just skipping it. I'm not sure if that's the only reason or not though.
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Core 2 Quad Q9550 @ 4.1GHz
Asus Rampage Formula X48
ATI 4870X2 2GB GDDR5 (800/1900)
4GB (2x2GB) DDR2 960
750GB SATAII w/32MB
Creative SB X-Fi Titanium Fatal1ty
SilverStone 750W +12V@60A
3DMark06: 22605
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