It's all about yields, with 40% and 65nm per cchip will cost USD110, and if nv can go with 55nm and yields up to at least 60% per chip will cost around USD 70 , it's almost ideal to USD 50, the cost that every highend chip should be. I think the cost of GTX280 about USD175, and with 55nm it can get lower to USD135 more room for lower price