Interesting - a presumed leaked review apparently written by AMD's marketing staff.
I wonder, since it doesn't say, if they used 3 GB GTX 580 cards or intentionally crippled the figures for larger resolutions by using a 1.5 GB version.
Does it really?
At TPU, using same drivers, games etc, closest 2 matches I could find regarding clocks (while having same drivers & games)
GTX580 3GB @ 832/1050 is 5% faster than reference 1.5GB at 2560x1600
GTX580 1.5GB @ 816/1002 is 3% faster than reference 1.5GB at 2560x1600
So 3GB had 2% higher core and nearly 5% higher mem clock, and was only 2% faster at the highest resolution, compared to 1.5GB version.
You really think that 1.5GB cripples it?
(yes, there can be games where it does, but on average it doesn't, and the TPU benches include many of the games used in AMD benches)