Soleron on 14 June 2008
Leaked performance slides. HD4870 is 1.4x a 9800GTX, and HD4850 is 1.4x an 8800GT. Taking into account the scaling seen from 3870 to 3870X2, this means that a 4870X2 will be 2.25x a 9800GTX, easily beating a GTX280.
Take that, Nvidia!