CPU temperature

[Jay Smith]

The fan in my Aukru Raspberry Pi 3 Fan Case (£6.99) seems very quiet to me. I can just hear it with everything else turned off in the room but in normal use, I don't hear it. 
I had to remove the ASUS heatsink as there was no clearance between it and the fan. 
I tried running the ATB, in the case, with no heatsink, which seemed OK, and also with the supplied RPi heatsink (shown). I could get the CPU temperature up above 60 deg (ambient 23 deg C) if I pushed it hard, with or without the heatsink. The temperature seemed to recover quicker with the heatsink but this is a subjective judgement as I didn't carry out any actual measurements. 

The Aukru is a good choice for the ATB, IMO. Note: The ATB is a tight fit in the case and requires a little jiggling to get the HDMI and power sockets to fit into the case.

I notice you have the fan plugged in the 5v pin.
You can separate the red plug and plug in the red wire to the yellow pin or pin 1.
The fan will run at 3.4 volts slowing the fan down with less noise and extending the life of the fan.
Use black electrical tape on the red wire to insulate it.