[synackrst]

Some GPUs have fans that spin down entirely under light load (Asus calls it 0db mode), and only spin up the fans when under moderate to heavy loads.

[qplex]

Yes. Also, at least With NVDIA cards, you can specify a temperature target to the driver. I think the defaults usually run the chips at ~70C.

I guess the fans are actually mostly 100mm in 2x fan configurations, manufacturers seem to have many custom solutions for blade configuration etc.