As far as I know, different bench OS for each of us. I'm using a retail copy of W7 Pro. No stripped version. Original sysinfo that comes packaged with the download.
PCMark 7 was made to run on W7 so I doubt W10 is needed, although it may score better.
I'm on a 775 setup. Pete is on something else. I don't know what platform. I wanna say Haswell.