the OS is only handling CPU related ram, the GPU ram is handled by the gpu, the CPU is not really aware of it.
4870x2 on a 32 bit OS doesn't make you forced to use, 1,25 Go of RAM.
the missing ram from 4Go on 32 bit os is due to system adresses.
it would be the same thing that saying cache on a raid card would limit your available OS ram
as for fermi pricing...i guess it will depend on perfs i guess...and how ATi will react to that
[auto edit, i realised i was a bit rude ^^]
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