I have to say it preforms really great just as I expected it to. What I've notice is that the GPU "sets" the range of FPS for a game because when I go to very low graphics settings, the game would get around 30-50 fps, but then when I max out the graphics settings, it would still get around 30-50 fps. One thing that's really not good, this GPU runs extremely hot. It has just as much ventilation as my old card, but this card runs some 30-40°F hotter. When I'm playing GTA IV maxed out, it averages out between 175°F - 185°F. My old GPU would reach 160°F at most ever.
But this card is just outstanding; just look at these benchmark results from GTA IV maxed out!
Statistics
Average FPS: 42.56
Duration: 36.89 sec
CPU Usage: 74%
System memory usage: 61%
Video memory usage: 55%
Graphics Settings
Video Mode: 1920 x 1080 (60 Hz)
Texture Quality: High
Shadow Quality: Very High
Reflection Resolution: Very High
Water Quality: Very High
Texture Filter Quality: Anisotropic x16
Night Shadows: Very High
View Distance: 100
Detail Distance: 100