I posted a thread regarding my new PC not being able to play this sim due to CTD. In that thread another RTX 3000 user had almost exact same issue. (Before anyone says anything, I know some of these cards had issues at launch but the issue that got all the media attention has been resolved with the new drivers)
My PC Build (Without any overlocking)
i9-10900k 3.7
RTX 3090
32 GB Mem
1 TB SSD
Bug: Game CTD ~ 5 minutes into takeoff
I don’t have a 3000 card but I know aftermerket sellers are putting cheap resistors on the back of the card, causing them to crash under load. Checking that first might be beneficial.
That’s been resolved by the recent driver update.
3080 FTW3 owner here. No issues at all.
Do you use any custom graphic settings or did you modify any settings in the nvidia control panel?
i customize low latency mode off, vsync on, gsync on. That’s really all the rest is default.
What about in MSFS? Ultra settings?
All ultra. Something is wrong it seems like. I have a 10700k with standard overclock to 4.7 stable. I
Dell with Intel i7 - 10700f
Nvidia RTX2060
32 gb DDR4 - 2933MHz
MSFS “HIGH”
No problem !
My issue is I can’t even get hold of one. Sorry, couldn’t help myself. But as soon as I’m able to get one, I’ll post my experience with fs2020.
3080 gaming x trio + 8600k @ 5ghz runs fine. although even with ultra settings its not loading the card on 100% 
I do get random crashes occasionally, but its not repeatable nor it really seem to relate to the card, as it usually crashes at places like finishing a leg in bush flight, or some other loading/mode changing stage.
because MSFS cant address a RTX 3090, my MSI is running on max. 50-60% which is no surprise to me coz MSFS has no DX12 nor RT …
whatever the bottleneck is (though if u enable developer mode and enable fps counter, it keeps saying “limited by mainthread” unless there is some heavy weather going on), it still bumped the FPS quite a bit, compared to 1080ti. So totally worth the upgrade 
Could be worth checking your Eventviewer after the CTDs to get a better understanding what exactly the issue is. Maybe, it’s not even a GPU issue and OS or game file related. If there is a CPU related error, the CPU could be the problem.
What is the GPU Load for all of you guys? On Max settings running to a 4K TV (graphics set on default Ultra Settings) my GPU is running at 95-98% in my flight.
It’s showing GHz ranging from 1600-1900.
Why is yours only using 50% and mine is maxing out?
Solving a hardware problem with software doesn’t actually solve the problem. In this case, the low quality capacitor problem was solved by downclocking the cards - what an amazing solution. This is the same strategy Boeing used with the MCAS on the 737 MAX, and we know how that turned out.
I’m running a GeForce RTX™ 3080 EAGLE OC.
3440x1440.
No issues.
Sounds like you have an unstable overclock.
coz i am on WQHD not 4k
The low quality resistors are going to fail far quicker than the cards that were built decently. A lot of 30x cards are permanently damaged due to this issue - I would ensure you’re able to run similar high-demand games without issue. I recently received my MSI 3090 and have not run into issues so far.
That’s a perfectly fine GPU load especially seeing as you’re running on 4k.