This is the same data and format and the same scenario that I have been self-testing for some time.
I have not been able to test many times, so this may not be accurate, but I will only share DX12 compared to 1.27.16 and 1.27.21.
1.27.16 was certainly faster, but probably not “dramatically” different.
p.s Oh, it is not 09, it is 16. Correction.
p.s2 This is verified with the new Studio driver (517.40)
