PC freezes randomly only when I use my Nvidia graphic card

Hello! I have a newly built desktop (PC's specs are listed below) for around 1 month but it has been frozen randomly, like when idling, google chrome, it happens around every 5 to 12 hours (normally), sometimes it won't freeze even I leave it idle overnight for 12 hours but sometimes just few mins after reboot, nothing is working when the problem occurs, not the keyboard, mouse and just a freezing screen (no bluescreen or error window) I have to do a hard shut down everytime. However, when I plug my monitor HDMI cable from my graphic card (RTX2080) port to my motherboard HDMI port (and my device manager will show a new display adaptor: Intel(R) UHD Graphics 630), my PC won't freeze anymore (at least 24hrs so far). I am really noob about PC stuff so I wonder if it really my RTX2080 graphic card problem? I saw some people have the similar problem but not exactly same as me said SSD, PSU or motherboard is the main problem actually. So I hope if anyone can tell me how to find out the possible cause(s) in case I spending more money on a normal hardware. The methods I have tried are list below too. Thanks so much Happy

new update:
- I just found out if I leave my PC idling and not using any other program intentionally (i.e. just idling on desktop and leaving some basic softwares, programs on e.g., anti-virus software, network), my PC wont freeze even I am using the RTX 2080 graphic card
- using FurMark for testing my RTX2080 graphic card for around 15 mins and no freezing or crashing
- Joulemeter Taskbar shows my PC power consumption is under 200W even under the FurMark test

My PC's OS:
- Windows 10 Home 64-bit Full Version Box USB

My PC's specs:
- CPU: Intel i7-8700K (3.7GHz)
- Graphic Card: MSI RTX2080 GAMING X TRIO OC Edition 8GB GDDR6 3 Fans
- MB: ASUS ROG Strix Z390F Gaming
- RAM: G.SKILL Trident Z RGB DDR4 3600MHz (2x8GB)
- SSD: Samsung 500GB 970 EVO M.2 NVMe
- HDD: WD Blue WD10SPZX 2.5" 1TB 5400rpm 128MB Cache SATA3
- Cooling: NZXT Kraken X62 Water Cooling
- PSU: Corsair RM750X 750W 80Plus Gold
- Network Adapter: ASUS PCE-AC88 AC3100 Dual-band 4x4 PCIE Wireless Adapter

Methods I have tried but all failed:
- Memtest86 (free version) and no error founds
- Windows Clean Boot (but some programs can't be disabled in System Configuration like "AsusUpdateCheck")
- Reinstall Windows (clean install) (by my Windows 10 Home 64-bit Full Version Box USB)
- Update all drivers in the Device Manager (I manually select all drivers and search updated driver software automatically)
- Download and update my graphic card, SSD, Motherboard, Network adaptor drivers from its official website
- Windows Update check is latest
- Look at the Event viewer (administrative events) and no possible error/warning founds
- Look at the Task scheduler
- Update BIOS
- BIOS set to default
- In my BIOS changing "primary display" from "AUTO" to "PCIE"
- In my BIOS changing "Above 4G Decoding" from "Disabled" to "Enabled"
- Change my HDD SATA power Cable
- Use avast Cleanup
- Uninstall all third-party Anti-virus software (just leaving the Windows defender on)
- Use 2 RAMs together OR try each RAM individually on my motherboard A2 RAM port
- Turn on my GPU's fans by MSIAfterBurner all the time (my GPU's fans won't run if temperature is below 60°C by default)
- Observe my CPU, graphic card & RAM's condition, the temperature, loading were normal right before freeze
- Clean PC's temp file
- Adjust virtual memory
- Run windows disk check
- Run a windows system file check
- Turn off Link state power management
- Set my PC power plan to highest performance or balanced
- Set my Hard Disk "turn off hard disk after __" to never
- Turn off all windows background apps

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Others are reporting same.
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Motherboard and RTX-20xx Series Have Problems

Trouble reports at various online forums indicate your motherboard AND your graphics card are causing headaches for many users.
The easiest step you can take is probably to remove the power cord, disconnect all power supply cables from the motherboard and g-card, then carefully but firmly reconnect the cables. Not likely to resolve the issue, but worth a try.
The next step would be to substitute a different graphics card which is NOT from the recent Nvidia RTX series. Try a GTX1050, or GTX1060, or Radeon RX570 or RX580.
If the above measures don't cure the problem .... well .... motherboard time!

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One other possibility that comes to mind ...

... would be the power supply.

Living in a high lightning incident area, I have seen power supply units going south just a little bit and thus becoming marginal. Or you put one in that is just barely coping as long as there isn't too much activity (the graphics behaviour might be a clue.) I have also seen a PC going from solid to marginal with intermittent problems just by adding another couple of disk drives.

I don't see any strong and conclusive evidence here, but my gut tells me that this is a possibility here and if you can borrow a stronger PSU to try it out this might be a comparatively easy and affordable fix to the problem (just as long as that IS the problem ...)

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