PC Graphics

[amdsdafk]

GPU AMD Radeon RX 6800 @ PCI Express 3.0 x8

CPU AMD Ryzen 5 2400G with Radeon Vega Graphics

Monitors: 2* AOC Q32G2WG3 + 1* AOC 32G1WG4

Crazy symptom: Tried to activate eyefinity (both new monitors at lower resolution, tried eyefinity pro from AMD folder -> fixed issue besides #3 and #1 switched)

After some tinkering around, once I plugg in a third monitor, ALL are black. I can only use two?!

I've expected some issues, but this leads to a dead end for me.

Any recommendations? (I'll update mainboard + CPU next year - if this is the limit, why did it work at least without eyefinity before?

[elstaci]

need more computer information besides exactly how you have all 3 monitors connected and if you are using any adapters and which type of connection, HDMI or DP?

[amdsdafk]

The currently working two monitors are via DP connected.

I tried the third monitor both with DP and HDMI (worked before with HDMI)

No adapters of any kind.

//Edit:

If I switch off any of the three monitors, I can work with the other two

[elstaci]

Could it possibly be a PSU issue in which the PSU is outputting enough power to run 2 monitors but not 3?

Download OCCT and run both the GPU and PSU tests and see if it crashes during the testing period. Also check to make sure your PSU outputs are all within 5% tolerance range during the tests.

Also do you have all 3 monitors connected to your GPU card or do you have one monitor connected to your Motherboard video output using your AMD IGPU?

If you have all 3 monitors connected to your GPU card are you using a MST Hub or are all three connected separately to the GPU card?

Try connecting one Monitor to your Motherboard video output and the other 2 through your GPU card. what happens?

Also make sure you have the latest BIOS Version installed on your motherboard and the latest Chipset drivers and graphic drivers.

Might also be a defective Monitor cable.

Make sure your Windows is fully updated via Windows Update.

EDIT: Even though this is for a Dell setup with Multi Displays it gives good troubleshooting tips of which I mentioned some of them above: https://www.dell.com/support/kbdoc/en-us/000132851/how-to-troubleshoot-multiple-monitor-issues

[amdsdafk]

All three monitors have their own built in PSU and can run on their own - so I'd rule that out?

No hubs involved, I just plugged them in directly.

I've disabled the internal GPU as I had some starting issues.

Updated the chipset drivers now, GPU is already up2date.

Windows is up2date (only one optional realtek network adapter driver available)

//Edit: Will run OCCT and update this post

"Power" is running right now, no issues so far. My PSU is overkill for my current setup to be honest (850W)

[elstaci]

A 850 Watt PSU should provide sufficient power to run 3 monitors without issue. So it could be some sort of Graphic conflict or bad cable or it isn't configure correctly in AMD Settings and the Monitor's settings.

By any chance have you tried running all 3 monitors at a lower Resolution to see if that has any affects?

Also are you using Ultra High 4K Resolution Monitor cables for DP and HDMI versions for your GPU card?

Maybe the 3 monitors are exceeding your Video Port Maximum Resolution for its DP or HDMI versions.

According to AMD your RX 6800 uses DP version 1.4a and HDMI version 2.1.

DP 1.4s specs: https://cablesradar.com/refresh-rate-and-resolution-of-displayport/#Refresh_Rate_Resolution_of_Displ...

Refresh Rate & Resolution of DisplayPort 1.4

Now, the most used version at present, DisplayPort 1.4, has some cool features for all of us. It was launched in 2016.

DisplayPort 1.4 supports 8K UHD (7680 × 4320) resolutions at a 60hz refresh rate; if you run 4k resolution, it can have a 120hz refresh rate. It is the first version to support 8k resolution.

This can be great if you play games or do other things at 4k and 8k resolutions.

DisplayPort 1.4a, which VESA launched in 2018, but not many details are available about this version.

HDMI 2.1 Specs:

HDMI Specification 2.1b Features Include: https://hdmiforum.org/specifications/

• Higher video resolutions support a range of high resolutions and faster refresh rates including 8K60Hz and 4K120Hz for immersive viewing and smooth fast-action detail. Resolutions up to 10K are also supported for commercial AV, and industrial and specialty usages. More Info...
• Dynamic HDR support ensures every moment of a video is displayed at its ideal values for depth, detail, brightness, contrast and wider color gamuts—on a scene-by-scene or even a frame-by-frame basis. More Info...
• Source-Based Tone Mapping (SBTM) is a new HDR feature that allows a portion of the HDR mapping to be performed by the Source device instead of the Display device. SBTM is especially useful in cases where HDR and SDR video or graphics are combined together into a single picture, such as picture-in-picture or a program guide with an integrated video window. SBTM also enables PCs and gaming devices to automatically produce an optimized HDR signal in order to maximize the utilization of the display’s HDR capabilities without manual user configuration of the Source device. More Info...
• The Ultra High Speed HDMI Cable supports the 48G bandwidth for uncompressed HDMI 2.1b feature support. The cable also features very low EMI emission and is backwards compatible with earlier versions of the HDMI Specification and can be used with existing HDMI devices. More Info...
• eARC simplifies connectivity, provides greater ease of use, and supports the most advanced audio formats and highest audio quality. It ensures full compatibility between audio devices and upcoming HDMI 2.1b products. More Info...
• Enhanced gaming features ensure an added level of smooth and seamless motion and transitions for gaming, movies and video. More Info... They include:
  • Variable Refresh Rate (VRR) reduces or eliminates lag, stutter and frame tearing for more fluid and better detailed gameplay. More Info...
  • Auto Low Latency Mode (ALLM) allows the ideal latency setting to automatically be set allowing for smooth, lag-free and uninterrupted viewing and interactivity. More Info...
  • Quick Frame Transport (QFT) reduces latency for smoother no-lag gaming, and real-time interactive virtual reality. More Info...
• Quick Media Switching (QMS) for movies and video eliminates the delay that often occurs when a device changes from one HDMI frame rate to another. More Info...
• HDMI Cable Power enables active HDMI Cables to be powered directly from the HDMI Connector, without attaching a separate power cable. This makes attaching and using active HDMI Cables as easy as using passive, wired HDMI Cables. More Info...

Version HDMI 2.1b of the HDMI Specification is backward compatible with earlier versions of the Specification and is available to all HDMI 2.0 Adopters.

[amdsdafk]

So both OCCT test are running fine, no issues to see

BIOS is up2date (old, but new versions are only for newer CPUs)

"Might also be a defective Monitor cable." -> I confirm that point as possibility, however I've the issue on the same new monitor with a new HDMI/DP cable?