Yes, but aren't S5's known to sometimes overheat when the internet goes down and there's no hashing going on? I personally added a rear fan and wired it to a full 12v so it's always running full out even if the internet goes down and the controller board signals slow or no fan speed.
I have a pair of S5's that do indeed heat up when the internet goes down. Others don't have that problem. I would suggest S5 users, kill their modem to force a test on their S5's to see how their's react with no internet. My fans slow way down, but the heat goes way up. YMMV