Feature levels and Compute versions question FAQ

Community Community & Industry Discussion
1

Hello Unreal community,

i’m new to the editor. here i introduce my current presentetion/

As we tried UE4 version 4.25.1 and failed in requirements
Our actual hardware is NVIDIA Geforce 9800GT. (oldie but goodie) (Phenom II x4) (6 Workstations)
When using UE 4.0.1 everything seems to work, i’ve got some questions regarding the editor and SM (Compute capabilities)

  • Our hardware has SM1.1 or CUDA 1 compute capabilites. and OpenGL 3.0
  • UE4 version 4.25 has issues working for SM <4 reported as DirectX feature level 10.1 errors
  • UE4 version 4.0.1 accepts SM1.1 with no DirectX errors.

Questions are:

  • How can we know which Feature levels relate to CUDA SM Compute levels, and OpenGL, OpenCL capabilities?
  • I’d like knowing forehand (instead of loading each version incrementally) which is the highest version of UE4 supporting my current hardware.
  • Are there any hacks to run higher feature levels ignorning SM support? i’ve seen -no-vsync or -OpenGL flags may help
  • Do you know any issues regarding using lower UE4 versions and higher SM compute capabilities that may older apps working on newer hardware (aka notebook)

Thanks community for any ideas.

2

How old is the NVIDIA GeForce 9800GT?
DirectX 11 supports Shader Model 4 and 5, and also somewhat current OpenGL version…so I would think if the GeForce 9800 GT is as new as DirectX10 / 11, then it’d work.

There’s a question on AnswerHub or in the forums about 4.25.1 throwing DirectX 10 feature level error(s), that was posted in the past week or two, I think. Do a forum / AnswerHub search for some answers in addition to waiting for more complete responses here.