Hi.
My game runs at 60-70 FPS inside the buildings, and 40-50 outside with 16-32 players, in running some test to have a full panorama on what is going on, and for the GPU Load and temp, download OPENHARDWARE MONITOR to check the maximum and minimum values fo your card so u'll notice that GPU runs at 100%
my specs:
Windows 7 SP1 X64
8GB RAM 1600MHZ
AMD Phenom II (4) X64 Black edition 3.4Ghz
AMD HD7770 GHZ edition
1080p gameplay
AMD 13.12 Drivers
Everything on TAB 2/3/4 is OFF