I thought it was a brilliant idea, adding on to the resources you already have spells efficiency, and fatter wallet. But I was quite disappointed that Crysis did not show much performance gain at all when I installed a second HD 5850 at the cost of $240.
I hope Crytek has already made Crysis 2 much more efficient than Crysis and WARHEAD, taking advantage of our old equipment instead of buying new is quite favorable.