I have a EVGA GTX 660 TI 2GB 16X PCIE. On directx 11 or the game is set on directx 11 it runs slow in frames and kinda laggy, even at [low 35fps] and [high 30fps] settings. BUT! when I switch it too "directx 9" it runs perfect like it should, even at ultra settings.
Games I have tried Frycry3, Hitman absolution, Saint row 3, Deus ex revolution. The one game that didnt do it was sleeping dogs.
I had this problem ever since my pc was built, I'd tried reinstalling the graphic card drivers and switching in game settings.
my set up
GSKILL TWO 4GB DDR3 1600 RIPJAW
ASETEK 570LX 240MM WATER COOLER
ASUS P8Z77-V LK Z77 MOTHER BOARD
EVGA NVIDIA SUPERCLOCK GEFORCE GTX 660 TI 2 GB 16X PCIE
WINDOWS 7 HOME PEMIUM
SAMSUNG 840 SERIES 2.5" 250GB SSD SATA 3.0
CORSAIR CMPSU-750TX V2 POWER SUPPLY