Trusted Reviews posted a review of the new 7900 GTX.
The headline figure is that NVIDIA has finally followed ATI and movedNVIDIA GeForce 7900 GTX Review
to a 90 nanometre manufacturing process. This brings a whole string of benefits. Firstly, the actual physical size of the GPU is reduced. It's roughly
half the physical size, so it costs less for NVIDIA to produce it and therefore it can make the card cheaper to produce than the viciously expensive 7800 GTX 512MB.
