Hi,

Have you check that the cables are securely connected to Reconnect the DisplayPort Cable: Unplug the DisplayPort cable from both ends and then plug it back in. This action will prompt the monitor to re-detect the connection, potentially resolving any connection issues.

 

The GPU is still working via HDMI and Displayport on the motherboard

Please explain what you mean, reason why this is important, the BIOS disables any onboard video when an add on video card is detected, this regardless as to whether or not the add on GPU is working or not, short version, you can`t use a video port on the MB and a port on an add on GPU.

The MB video ports work using on die graphics from the CPU and are independent of the discrete add on video card.

What is the brand and model name or number of the 850W PSU.

 

The HDMI on the 3080 is working as it sends a signal to the monitor, and The DisplayPort on the Motherboard IO is working.

The 3080 is currently performing via the DisplayPort on the motherboard. The 3080 is showing in the device manager and appears in the GeForce experience and RDR2 is running at 100fps+ in 4k with ultra settings. Due to the limits of the MB port, it cannot meet the capabilities of the monitor.

I can display to duel monitors at once via DP on MB IO and HDMI on GPU

The PSU is a CoolerMaster V850

 

You look to have pretty much nailed it as a DP issue then, you have a high end MB with dual graphic capability and while not the best of brands the V850 is a high end PSU, add both to the fact that the GPU still has working HDMI and it looks to be a done deal.

Not sure how much research you have done, but there is a related thread here it appears to be a common issue and one that is not brand specific.

 

Thanks for the link, It appears to have rectified itself after I reseated the GPU again (and found the stability stand I haven't used since changing Mobo/CPU 2 weeks ago). DisplayPort from the GPU is working

FYI the Mobo is the Gigabyte B650 GAMING X AX DDR5, Mid-Range as far as AX5 compatibility goes but still expensive.

Reading that threat I'm sure my issue is the same so I hope not but expect a reoccurrence. Will update.

 

Glad you have sorted it and thanks for letting us know how, it is evidence that the anti sag support should be used to ensure a 100% good connection between the GPUs gold finger and the PCI-E slot.

 

Thanks, it did since cut out again last night as I was adjusting colors in the Nvidia control panel.

I couldn't get it running again last night but this morning/day it has been working with no problem

 

Not saying that it is related but I've not used anything but Nvidea chipped GPUs for years and primarily the EVGA brand and I can honestly say that other than taking an initial look I have never looked at the control panel since, I stick to just the basic driver and have never had any trouble.

There's no denying that computers can be fickle

 

It worked most of today until it did not. I installed GeForce Experience and the monitor cut, no signal, nothing detected. Reset, still nada. It does appear to be software bound as i have not interfered with the hardware as it comes and goes

 

Have a read of the following Install only the driver for Nvidia graphics cards then see the below;

Create a new folder on the desktop, name it Nvidea drivers.
Manually download and save to the folder the drivers from here
Download DDU from here
Create a new system restore point then run DDU and uninstall all present Nvidea drivers.
Restart the computer in Safe Mode only (No Networking). **
Install the new GPU drivers that you saved to the folder on your desktop.
Restart the computer, test then post back with an update for us.
** Do a normal restart if the GPU drivers will not install in Safe Mode

 

I tried this and it didn't work for me, unfortunately.

Been doing some research and thought a firmware update would help on what is a known issue with DisplayPort on Ampere GPUs but it didn't work, also up to date.

https://www.tomshardware.com/news/nvidia-displayid-firmware-update

Left it to chill for a few hours, came back, and still not working. Having no luck tonight.

For a minute windows was able to detect a 3rd monitor when I had both HDMI & DP connected - it knew it was the 4k LG x2 but didn't throw an image, when I changed the source on the monitor to DP. The monitor just said no signal.

Stupid finicky technology is so frustrating. I added a post to the MSI Forum thread you linked but it was deleted MSI Global English Forum

So you think I should start a ticket with MSI, Nvidia, or Windows?

I also changed to Windows 11 2 weeks back so that could have caused it possibly? - update- reverted to Windows 10 and the issue persists

Assuming this keeps up I guess my options include getting a new monitor that is HDMI 2.1 capable or getting a new GPU in hope that would remove the problem

 

Frustrating for you

Your GPU warranty is with MSI so a hardware ticket needs to be with them.

Suggested test for you, disconnect the HDMI cable and try just the DP connections for a few hours and see what happens.

 

Plugged it in this morning and no issues! After hours of frustration yesterday, it's been running smoothly for 4 hours today and counting! I submitted a hardware ticket to MSI, it's still under warranty.

Here's hoping it lasts!

 

Here's hoping it lasts!

Fingers crossed for you

 

Update with a new development,

The DisplayPort of course didn't last... 3/4 hours then it cuts. Typically when I am closing/opening an application/program. Yesterday the HDMI continued to be reliable.

Today same deal with the DisplayPort, however the HDMI on the GPU also gave up after a few hours, it suddenly stopped giving a signal when I closed a game (this time it was Rust) - which is also when the DisplayPort tends to give out.

If I reset the system the HDMI works right up until I load into a game. Be it a demanding game such as Red Dead or a less demanding game like Dota 2. It crashes and HDMI gives no signal. 3080 Still detected in the device manager.

Have opened a ticket with MSI and tried their suggestions with no luck

1. Please check if the motherboard BIOS supports "Solo PEG" display mode.
2. whether the computer is a direct fast boot into Windows; when it appears that the DP port is connected to the computer and is in black screen mode after booting, please check the UEFI boot mode boot and install firmware such as links or attachments to see if there is any improvement.
NVIDIA GPU Firmware Update Tool for DisplayID | NVIDIA (custhelp.com)
3. If you can, please load your graphics card on your friend or family member's computer to test.

Couldnt try the 3rd option as I don't live near my family and my wife's computer won't fit the 3080 - its too long

 

Suggested test for you, disconnect the HDMI cable and try just the DP connections for a few hours and see what happens.

Try the above by disconnecting the HDMI cable from both the PC and the screen, if nothing from the GPU, disconnect the DP cables and try the screen with the HDMI first on the GPU and if needs be on the MB should you get nothing from the HDMI port on the GPU.

Worse case scenario, you may need to remove the add on GPU from the MB altogether to be able to get any signal from the MBs video ports.

Roughly 2 weeks ago I upgraded my CPU to a Ryzen 7800X3D 850W PSU and went to Windows 11 from 10, I assume the power would be enough, particularly as I haven't had any issues with the setup for 2 weeks.

Bit of a checklist for you;

The GPU has switchable BIOS, gaming and the less demanding silent mode, have you tried both settings.

Did you update to the latest MB BIOS before fitting the new CPU.

Have you installed the Windows 11 chipset drivers for the MB.

Have you installed the Windows 11 APU drivers for the CPUs on die graphics solution.

What are the brand and model name or number of the RAM and how many sticks of it do you have.

Just a fyi, the present PSU meets the requirements stated by MSI but allowing for your additional screens 1000W may be more appropriate Which power supply do you need?