document Compute Capability requirement
@@ -55,6 +55,7 @@ The latest version of each package will automatically be installed if missing.
In addition, you need to install `CUDA <https://developer.nvidia.com/cuda-zone>`_.
The following versions of CUDA can be used: 7.0, 7.5, 8.0 and 9.0.
+You need a GPU with Compute Capability of at least 3.0.
Optional Libraries
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