Got this board on Friday, and I must admit the SB fan is a whiny little thing. It was on stock bios when I got it and it seemed to be using the cpu temp for fan control as it was ramping up and down with the cpu fan. Updated to 1.70A (?) and it seems more under independent control.
Been monitoring it during a session of Division 2, and fan seem to drop to a minimum of 2,960 when idle - but ramps up to 5,844 max. Max SB temp is 77c. That's quite toasty.
I took the metal cover off to fit an M2 card, and noticed there is a thermal pad on the top of the SB heat sink so that should also be transferring heat to the metal plate too?
Awaiting an aftermarket solution - fine with a long heatpipe and something at bottom of case/front of fans if needs be.
As for M2 slots - I put mine in "M2_2", the middle of the three and in the centre of the cover plate. Do I need to fit M2 cards in order? Also nothing in the manual showing resource allocations so don't know what slots share resources etc.
My old pc was 7 years old, and that board had a heatpipe connecting SB to power heat sinks. Not sure why this kind of setup was used on most X570 boards. How does power draw of a Z77 intel chipset compare to X570?