We aren't expecting to see the official R520 launch until later this year and not at Computex, based on information we've been hearing from Taiwan. The fact that there is working R520 silicon at this point is important, as NVIDIA is sure to be talking quite a bit about their GF70 GPU at the show.Read more at AnandTech
ATI showed R520 GPU at E3

ATI yesterday showed off its R520 behind closed doors at E3 Expo 2005.