FUCKYEA
We support both Shader Model 5 (DX11) and Shader Model 4 (DX10) cards for UE4. As Oscar mentions you can force the engine to use the Shader Model 4 support path with "-d3d10" on the command line. Obviously some features that require DX11 will not work: tessellation, reflection environment, and sorted GPU particles for example.
At this time we are not supporting Shader Model 3 (DX9).
No Sana No Life
