You only get 900mb effective Vram, which will increasingly begin to strangle the card as newer games come out. The extra 100mb does make a difference.
ok fair enough, how about the card i recently bought from a certain auction site for £130, perfect condition, running fine as we speak on 10.4 drivers (since 10.7 are broken), has 2Gb of VRAM (1Gb for each GPU) and still destroys the GTX 460 at everything barring crysis minimum frame-rates (but as said before, FERMI advantage). so from my point of view its £30 cheaper and quite a bit more powerful, plus doubles up as a heater in the winter!

about the GTX 460, heard the gigabyte ones are supposed to be good.