JTL
I have a bad 950 and I'll test this on Win7 and Win8.1 if someone writes a step by step for how to do this properly as I'm not convinced I've done this correctly.
Edit: Nevermind I've definitely done it correctly.
I will test my bad cards over the weekend and see what's happening.
I also have a theory that one of my newer motherboards (2017) is forcing dithering via the BIOS persisting into the OS somehow. I will test it on this as well.