Will GPU Memory have to be identical and what about the clocks? The shaders are also different and how would this work when stream processors will be totslly lopsided. I suppose this will work in DX11? So how would a GTX285 which isnt created for DX11 work with a 5870 or 5850 which was made with DX11 in mind?? So many more questions than answers.... would you buy this if it were 400-500 dollars??