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Windows Direct x11 and x12 are not a fair comparison to OS but here are some comparative benchmarks.
Windows dedicated pic card. Windows open gl dedicated pie card.
View attachment 217863 View attachment 217860
Windows igfx open gl
View attachment 217864 View attachment 217865
So, the performance in windows open gl is very close. If the RX 480 is missing 20 out of 36 compute units, how is it keeping up with the windows benchmarks while in the inferior 16 cu unit limited Sierra?
Luxmark shows 16 compute units but it also lists it as a prototype. 30bit (ARGB201010) is also present, so although the RTX 480 is not perfect it beats the heck out of my 18 compute unit RX 460 in every test. And it certainly beats the HD 530 graphics in every way. For $250 US its not a bad card for budget buyers and I believe these benchmarks are close to the 970 Nvidia cards in Sierra.
I run Geekbenche's 4 Compute and it gives me a ~85000 score when my RX 480 should perform around 125000 (probably with windows drivers).
There is definitely something wrong here.