OCIA.net has posted a review of the Logisys Pitbull 500 watt PSU.

I couldn't find any specs on the rear fan but the low setting was about the same as a normal PSU rear fan. Cranking it to high created great airflow out of the back. Unfortunately this was quite a bit louder. I would guess its in the 30+ dba range; definitely audible over the other fans in my case.

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