need windows 7)

^ Windows 7 is super easy to install with usb drivers on a cd and a ps/2 kb

I'm pretty sure that a 7700K is Kabylake and therefore win 10 is allowed.

He said you need W7 because the Cinebench benchmarks score better in W7 than W10...

I don't think they posted to tell you that Win10 isn't allowed

EDIT: What Guns said

I did not send a message stating that windows 10 is not allowed

just saying that the result will be better on windows 7

He said you need W7 because the Cinebench benchmarks score better in W7 than W10...

Oh yeah I'm aware of that. Except I had like 10L of LN2 left over and a new delivery was coming soon(not enough time to get the right OS) so I went with the only working Z270 OS I had on hand and ran with it.