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Deus Ex: Human Revolution runs poor with i5 3570k and HD 7850

Last response: in Video Games
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This game for some reason runs extremely poor.
My setup is
CPU:i5 3570K
GPU:Sapphire HD 7850 OC 1gb(1100 core and 1300 memory clocks)
RAM: 8gb ram(1333)

In the city it drops to 20fps or less and indoors it almost never reaches 60fps. I have the game in DX9 with lowest settings. Has anyone else had this sort of problem and found a way to fix it?

I have figured out the problem(at least for me). When the game is in DX9 it seems to have major performance problems. I left the game and changed the start up settings in steam to DX11 and the game stopped having performance issues. I have not bothered to change the settings in-game to see if the game has a problem changing them in-game as I am too scared that the problem will return.

I can now run the game on max settings with 2560x1440 downsampled to 1080p with sweet fx at 80+fps.

1.Leave game if you are in it
2.In steam select "Setup Deus Ex:Human Revolution"
3.Select Use Direct X 11

I might have done some other things but this is what I remember doing.

@eklipz230
I checked your thread and you are correct. ENB mod drops the game to 5fps for me as well.
!