I don't know if this was posted before but here it goes:
http://www.semiaccurate.com/2010/02/20/semiaccurate-gets-some-gtx480-scores/
http://www.semiaccurate.com/2010/02/20/semiaccurate-gets-some-gtx480-scores/
Getting back to the selective showings of the GTX480, there is a good reason for it. The performance is too close to the HD5870, so Nvidia will be forced to sell it at HD5870 prices, basically $400. The GPU isn't a money maker at this price point, and at best, Nvidia can price it between the $400 HD5870 and the $600 HD5970. The only tools left to deal with this issue are PR and marketing as the chip is currently in production.