I get around 20-30FPS in world boss and WvW zergs (usually 50-100 players) in GW2, which is mostly CPU based.4
Games that use GPU I can get 75+, unless I use VSync, which I do in most games to prevent screen tearing, in which I get 60FPS stable, most of the time.
This is playing @ 4k (3840x2160) usually High/Ultra all settings.
Guess it just benches bad but performance is still good enough. What is funny is I do not see much performance gain in some games whether I play with or without Vertical Sync.