Hybrid GPUs or any AIOs are hit or miss. I’ve had some that are quiet enough that case fans absolutely drown out the noise, and some that sound like you described. It could even be air trapped in the pump. Have you tilted your case every ol’ which way to try to work out any potentially trapped air? Also, is your radiator above the card?

Yeah mine is rather loud at idle too, but it's soooo much quieter than the air cooler when under loud (plus 20C cooler) that I've learnt to happily live with it.

There's a cable mod you can do to allow the motherboard to ramp the pump speed down when idle, which completely gets rid of the noise, but I haven't bothered. Search around on this forum if you want more details.

I had this issue with my 3090 hybrid, I  had to RMA it cause I didn't wanna cable mod it and then I got a new card, to fix that issue. asetek pumps are frustrating, cause if even the tinyest ammount of liquid is not in the pump it will just sound awful.

when ever I get more money for pc stuff I am going to get an EK d5 pump and water block cause D5 pump > >>>>>>>> Asetek AIO

LeoBurr
I really don’t want to have to RMA it again…they sent me the exact same card back. No guarantees they wouldn’t do the same thing again. 

then consider doing water black then, cause that is really the only option you have.

and if you cross ship they couldn't happen cause they would have to send you a different card and you send the card to them after you get new card so that also is option.

or you can do the pump cable mod by searching the forum for information on how to and decreasing the pump speed from 100 to 90 or what not.

I think I'll contact EVGA and see if they're willing to do an RMA and send me an air cooled model to replace it.  I can live with a little less performance to get rid of the fridge sound beside me.  Otherwise, I may look into the pump power adapter to see if adjusting its PWM speed helps at all.

Time for the adapter cable and pump voltage control mod.

LeoBurr
Ordered the adapter as well as a 2-pin sensor to tape to the back of the card using engine bay tape.  My mobo has temp sensor headers, so we'll see if this is a viable solution.  Everyone's situation is a little difference, so we'll see if this works for me...will know in a couple of days.

I’m not quite familiar with this mod, but I recommend caution because physical mods could void your warranty. At the end of the day, it’s your card and your choice of what to do with it. Just throwing it out there.

Awesome, let us know how you get on.

This got a little more complicated, but learn as you go, I suppose. If I set the mode on the mobo to PWM, the pump runs at full speed and the fans can be controlled and report RPM. If I run by voltage, I can control the pump, but the fans are in lockstep voltage percentage with the pump. It seems okay as I’ve peaked at 70.7C GPU Temp on the 3DMark Port burn-in tests with my system only making a slight air noise and the pump almost inaudible, with fans and pump pegged to the CPU temp (temporarily).

I’m going to use automotive tape to place a 2 pin thermal sensor on the back of the GPU and run the AIO fans to a y splitter off a fan header and then use the thermal sensor as the source for both. I’ll put the pump at 50% until it reaches 55C, then it’ll go 90%. At 75C, it will go 100%. Fans (Noctuas) via PWM will run at 40%, 70%, 100% at those same points. The Phobya sensor I’m using is a Phobya 10K Temperature Sensor, 80cm, Sleeved (a bit long, but I can tie up the remainder) along with Tesa wiring harness tape that’s engine bay rated. The Aorus Xtreme 1.2 I’m using has 2 2-pin headers, one that I’ll be leveraging for this. I’ll be comparing what EVGA precision says the GPU temp is compared to my external readings and adjust as appropriate.

This got complicated fast. But overall, the pump is no longer annoying. Thanks all for the advice. The pump’s lead ran neatly out of the same hole the coolant hoses do out of the shroud.

I didn’t want to run the rad fans and pump off voltage control. That’s just how it worked. I’ve since put my rad fans onto a motherboard fan connector, controlled via PWM with the pump controlled by voltage, and I canceled my sensor order since evidently the motherboard comes with two sensors. I ran the sensor lead along the metal plate of the GPU with 2 taping points and taped the sensor to the PCB right above the GPU. The sensor is within +/- 3C of the EVGA Precision GPU temperature comparing SIV and HWMonitor64. The tape is TESA 51056 150 Celcius (3000H) rated automotive tape.

TL;DR: So now my motherboard is controlling both GPU pump and fans based off the temperature probe reading at the GPU and the card itself is only controlling the VRM cooler fan. Ran 3D Mark again and GPU temp per 3DMark and HWmonitor showed a max GPU temp of 68.2C. The External sensor was 3C off of this at 68C. So I’ll compensate a bit in the curves.

The sensor has no exposed metal and is taped to the PCB, away from anything it could possibly interfere with.
 
EVGA should consider pump control in future card revisions or future GPUs.

It's a shame.  I've made the rep I've been working with aware of this thread, yet no EVGA representatives have commented here, yet.
 
When you have a product that has tolerances, some will be on the bad end of the tolerance range.  It makes sense to enable it to be remedied via software, since it's a relatively easy fix for EVGA's engineering that is impacting quite a few buyers of their ostensibly premium models.

While I appreciate the response, prior to all of this I'd already attempted the above.  It has always been mounted with the hoses above the GPU, and the radiator at the top of the case, exhausting as I have an Arctic Freezere II on the front..  I've rocked and tapped the radiator with it unmounted while in the BIOS.  Things did not tangibly improve in my situation.
 
I've rocked the whole system.  It did nothing.
 
What did solve the problem?  Pump control.  What are many folks, including Gamers Nexus (FOUR YEARS AGO) recommending?  Pump control.  What is EVGA not offering?  Pump Control.
 
I've been building PCs since about 1993 - This ain't my first build, AIO, water, or otherwise.  And EVGA taking a hard stance on this, and in my situation, simply plugging in my card, saying, "annoying noise normal" and sending it back to me in the same shape, with no note, and me needing to contact support for them to tell me that yes, I did in fact send my card on a pointless $100 round trip to Brea, CA, and they would do absolutely nothing, is the epitome of bad customer support, from a company that for years I praised for its amazing support.
 
As has been said above, this has been mentioned to EVGA, but they aren't doing anything about it.  Improve tolerances or provide a way in software to mitigate that has been proven.

Both Hybrid and Strix LC uses Gen 7 Asetek.  My Strix LC had perfect pump noise but today It started to make GURGLING noise. I tried to place / orient best possible way. (  open to comments for my orientation )   
 https://imgur.com/Ns9xt3T
Asetek gen 7 pump lottery is real..

LeoBurr
Howdy - Long time EVGA customer, and I’ve been very pleased with my cards. Up until my recent 3080ti Hybrid card. Its pump is making a noise not unlike an aquarium or refrigerator. I sent it back under warranty, out $100 for expedited shipping and got the same card back with the noise only slightly less than it was before. The card at idle is by far the loudest thing in my system, and it’s not a pleasant sound.

Has anyone run into this before? I sent it back once. My other hybrid kits didn’t make this noise. Is there even a possibility to get evga to send me a heat sink? I’d gladly lose the hybrid cooler if I have to listen to it vibrating away all day.

Any thoughts/suggestions are welcome.

When I bought the AIO for my 2080 I plugged it in and ran it while holding the pump in my hand.  The weird thing was it was loud at slow speed and dead silent at full speed.    But while it was on low speed with the heatsink facing up I flipped it 90 degrees and then it went dead silent, flipped it back to sink facing up and it went loud again.       
 
If I hadn't of went with the "Keep it at full speed always to keep it quiet" option I would have vertical mounted my GPU and this would have kept it silent on low speed.  So maybe vertical mount is a possibility?