OK time for an update on this situation. The creators of WIN X, Avangate, state all the technologies on their website that are used for decode/encode DVD's etc.....both AMD and nVidia technologies are mentioned but it appears AMD Radeon won't work with this software for hardware acceleration.
So I tried again last night on 3770 K with a nVidia GTX 1050 Ti - The results were impressive - 300 -400-500 fps so was evident hardware acceleration was working.
On Haswell CPU's QSV (quick sync video)_works with Intel iGPU and usually gets 200+ fps which is not too bad but with nVidia card the differences are great.]]
At some point I'll try handbrake