You and I are using same MoBo, CPU, Memory amount, Monitor Resolution/Size and OS. Basic difference is in the graphic card area. I use two(2) XFX 5770.
Ever since I cross fired them, I have been able to play all my games with graphics settings either on "Very High" or "High."
If you are using the EPU-6 cooling engine control application, set it to Turbo mode (if not set) before you start any graphics intensive game. This will increase the air flow inside your rig when the cards will be dissipating more heat.
Games played: Crysis, Amnesia, Ghost Sniper, Batman's Asylum, Singularity and others.