Pfft. A bunch o' cop-outs, bar Brasileiro.
Get Radeon pro, create a new profile. Select the Crysis 3 .exe file (Don't have crysis 3, so don't know what it's called). Turn AF, AA to off, make sure VSync is disabled. Change the mip-map settings to "High performance", tick the "Disable Aero" box, limit the framerate to 30fps.
Then, OC your card.
After that, turn down the resolution to 640x480. You might get lucky and pull of 30fps.