Fan Upgrade for my Optiplex 7090 MT

Hello everyone, this is my first time posting on this sub, and I need some advice from any of you out there.

So, to the point of the issue: I’m trying to upgrade the chassis fans on my Optiplex 7090 MT because I recently got a GTX 1660 super, and realized I’ll likely need to improve the airflow inside the PC.
I was thinking of installing a chassis fan on the back, and “juryrigging” a fan to the front to pull air in.
However, I read on the internet that Dell uses proprietary hardware that limits aftermarket fans and gives Bios boot errors if you try booting up.

I’ve seen the pin layout on the fan and the motherboard, and I see Four Pins. Is there anything I can do to circumvent this issue?
If I can avoid this issue, then what fans would you recommend?
The OEM Fan on the pc is an AVC DASA0820R2UPO21 “80mm by 80 mm by 20 mm.” On a personal note, I have been thinking Noctua fans seem like the best option, but I’m open to suggestions.

Posted Aug 8, 2026, 5:34 PM UTC

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