Harrison is right DC....
A Water Block & Rad setup would have saved you Lots of internal Case space & given you much better cooling on the CPU.
Whilst having the Luxury of a Water Block on my now ageing i7 3770K (OMFG, 8 years old now....) I noticed my 1080Ti's were hugely noisy compared to my old 780Ti's & my Chassis Fans were Ramping. - I have a couple of Zotac GTX1080-Ti AMP Editions in SLI now & yeah, I know I ain't seeing the best from these Girls....
But.... I discovered a solution that was really hard to discover.
Zotac's 1080Ti default Bios setting would spin it's three fans unnecessarily high causing lots of bad ass noise.
On top of this, my Chassis Fans were mis-behaving. They're hooked up to my CPU Fan Headers for convenience because I run a Water block. - Still with me......?
Run Zotac Firestorm, here's the greet screen:
FS01.jpg
After clicking on Spectra:
FS02.jpg
Click on the circled what looks like a slider button but isn't: (Grrrrr)
FS03.jpg
Set FAN STOP SETTING to "OFF"
Heh!- Now Blissfully silent until used/needed & my Chassis Fans now behave as they should. - My SLI'd 780Ti's didn't do this.
Zotac may now have changed this on their 20XX & 30XX Series Bios', but wonder if their might be some underlying issue here for you?
*Edit*
If this doesn't work for you, just send me your 3090 & I'll send you my two 1080Ti's. - I'm sure they'll be just fine for you! biggrin.gif






- Now Blissfully silent until used/needed & my Chassis Fans now behave as they should. - My SLI'd 780Ti's didn't do this. 
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