That would be 8.5T (R4). Don't worry, its not one of those Gekko usb sticks

I always wanted to get my hands on one of those R4's but could never manage to do so - is it really quiet enough to be in the same room with? I don't trust the videos I have seen lol
Get an old Canaan A741 - I first set one up a couple of years ago:
https://bitcointalk.org/index.php?topic=789369.msg19893916#msg19893916Under 50dB as a heater. You can make it slower (frequency) and quieter also.
I have that in my lounge room each winter.
This time I'll try an A851 and A921 to see if they can be as quiet on very low settings)
It is all to do with the fan speed and thus if the operational heat is lower, the fan speed will be lower.