Shouldn't the 7800 should have 512MB RAM?

Hi all,
I was just wondering, the 7800GT in my Quad only has 256MB of Video RAM, and this is the standard version that Apple offers. However, according to the nVidia website, all 7800 cards (including the Mac version) ship with 512MB.
What's the deal?
Thanks,
-Travis

Nvidia had 4 versions of the G70 chip on 2 different PCBs.
The GT version was on a distinct PCB and used 20 Pixel Pipes and ran at 400/500 Mhz.
The GTX came in 2 different versions, 256 Meg & 512 Meg , on a PSB slightly longer than the GT one. These had 24 Pixel pipes. The 256 Meg version ran around 430/1200 while the 512 version was ultra-rare & used expensive 1.1ns RAM. This coupled with hand-picked primo cores allowed this card to run at 550/1700. This jump in RAM speed represents a significant bandwidth jump.
Neither of these GTX card were offered for Mac by Apple or Nvidia.
The final version of the G70 was the Quadro, which uses same PCB as the GTX cards and thus also has 24 Pixel pipes, but runs around 470/1300.
Thus, there was a faster G70 than our Quadro.
The 7900 has followed a similar naming scheme with it's G71 processor, with the change that speeds for GPU have jumped 100 Mhz or so and all of the cards now have 24 Pixel Pipes.
Have a read at Barefeats.com. Some BRILLIANT folks have managed to get the Mega 512 card running in Mac
And you can always hope that Apple will give the PPC a 21 Gun Salute with a 7950 upgrade as a swan song.

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