Hi, 
I was looking for a decent 850W modular PSU for a low price and came across the Thermaltake GT 850W. 
It seems to be a adaptation of the GF A3 platform but adapted to ATX 3.1 but it's new to market, with most listings going up this month so had a hard time finding information. 
After pics and opening my unit up the PCB is almost identical, uses many of the same parts as the GF3 and a double sided PCB. My guess is that Thermaltake moved the GF A3 from China for the GT line (A version) that is now made on the old GF A3 line. 

This based on the Resonant Controller being the same CM6901X but match with what seems to be 6 
Lijun Power Semiconductor PTJ02N04NB - 40V 170A (seems overkill) 2mOhm, the 3.3 and 5V lines are the same APW7164 but now 4 of the AP MOSFETs from the GF A3 line. Paired with JiCON and CapXon caps. 

The 80 plus rating exists but it's sadly not tested by Cybernetics (yet?), but based on linage and the information I did find, I took a bit of a gamble as the closest 850W Gold unit is about 20-25% more in price.

However I notice while researching the PSU uses the same 120mm fan as the GF A3 650W unit and your review site seems to have different information than even your (as I understand it) testing lab about that fan.

So here is my conundrum, the fan is listed by Thermaltake and Cybernetics as a Hydro/fluid dynamic bearing 
thermaltake.com removed link  <- Specs says Hydro
cybenetics.com/evaluations/psus/2261/<- GF A3 650W Cybernetic report with  

same fan as I have in my GT 850W unit

The fan is a AV-F12025HS which is stated as a Hydro/fluid bearing but in your review of the GF A3 650W says 

https://hwbusters.com/psus/thermaltake-toughpower-gf-a3-650w-psu-review/3/

Is this a typo or are there multiple versions of the same product name?