Not every bench needs to be integrated in to BM, especially not if the creator requests that it isn't.
The ideal solution would be AMD to fix the timer issue like Intel did, but that probably won't happen...
If you have a look here:https://hwbot.org/submission/4067843
It's the 8 core Global First place and it's on Windows XP.
If you look at the Global First place you can generally see what the best performing OS is.
For older platforms either XP or Vista, not sure about new hardware.
Memory OC does not really help at all.
I haven't tested reducing maximum memory either.