Not sure about your and my idea of 'quietness' is, but even with fan changes and downclocking to sub 1TH, my S5's were still too loud and annoying to use in my office or anywhere near people. LOL.

Hopefully these new chips run cooler so they don't need a jet engine to fracking cool them off.
My SP20's at the same speeds were 1/2 as loud as my S5's..