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Re:Compulab Airtop – Natural Airflow Desktop by synackrst on Wednesday November 16, 2016 @02:57PM (#12970867)
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.
Re:Compulab Airtop – Natural Airflow Desktop by qplex on Friday November 18, 2016 @11:47AM (#12988048)
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.