Multiple screens

[CHASNDRT]

Dear HP Support,

I am reaching out regarding an issue with my OMEN by HP 25L Gaming Desktop GT15-1940nd PC (Product number: 92G33EA, Serial number: 8CG3360TN5).

Issue Description:

I am trying to connect three external monitors to my system via the NVIDIA GeForce RTX 4070 graphics card, but the system only allows two displays to be active at the same time. When I connect a third monitor, one of the other two automatically gets disabled. In Windows display settings, only two screens are recognized as active at any given time.

What I’ve Tried So Far:

• Verified that all three monitors and cables (HDMI and DisplayPort) are working properly.
• Installed the latest NVIDIA graphics drivers (version 576.88).
• Updated the NVIDIA App and GeForce Experience.
• Tested each monitor individually and in pairs – all work perfectly on their own or as a pair.
• Connected all monitors directly to the GPU outputs, not the motherboard ports.
• Checked Windows advanced display settings – only two displays show up.
• Restarted the system multiple times.
• Looked through the BIOS settings for any display/output limitations, but found nothing relevant.

Current Status:

At the moment, I am running 2 monitors: one through HDMI and one through DisplayPort. Both work fine. When I try to connect a third screen through another DisplayPort, one of the existing two disconnects automatically, and Windows won’t let me enable all three simultaneously.

Next Step I’m Taking:

To temporarily bypass this limitation, I’ve ordered a StarTech USB 3.0 to DisplayPort adapter (DisplayLink certified). This will allow me to connect an extra display via USB as a workaround, bypassing the GPU. However, I was under the impression that this desktop should support three monitors directly via the graphics card.

My Questions:

• Is this behavior expected for this specific model?
• Is there a BIOS or firmware limitation that restricts the number of active monitors?
• Does this graphics card fully support 3 displays on this HP system?
• Could this be caused by a manufacturer-specific limitation in the HP firmware or hardware?

I would appreciate any guidance or solutions you can provide to help resolve this issue.

Thank you for your time and support.

[NonSequitur777]

@CHASNDRT,

Welcome to our HP Community forum!

Thank you for your detailed question and the thorough troubleshooting steps you've already taken regarding your OMEN by HP 25L GT15-1940nd Gaming Desktop (92G33EA) with an Nvidia GeForce RTX 4070 graphics card.

 

First, some quick confirmations:

• The Nvidia GeForce RTX 4070 (desktop variant) is fully capable of running up to four monitors simultaneously via its output ports — usually a combination of 3x DisplayPort 1.4a + 1x HDMI 2.1.

• This capability is independent of the OEM (HP), assuming the system is using the full retail card configuration without custom restrictions.

---

Based on what you're describing:

• The system only allows two active displays at once.

• All monitors and cables are known-good.

• You're using the GPU’s ports directly, not the motherboard.

• You've updated all relevant drivers and apps.

This behavior is not expected and not a known limitation of the RTX 4070 or your desktop model — HP’s GT15-1940nd should support 3+ monitors directly from the graphics card.

---

Possible Causes and Recommendations:

1. HP Prebuilt GPU Variant Limitation?

HP sometimes uses custom PCB layouts or firmware-locked GPUs in OEM builds. It’s rare, but occasionally an OEM variant of a GPU may come with fewer active display lanes or altered power/BIOS settings.

Next step: Use GPU-Z (https://www.techpowerup.com/gpuz/) to:

• Check the "Device ID" and BIOS version.

• Look at how many display controllers (or output engines) are listed.

• Compare with a retail RTX 4070 BIOS on the same chip (AD104).

 

2. NVIDIA Control Panel Settings Conflict:

Sometimes, if the control panel is set to "Clone" or restricts display output to a certain configuration (e.g., Surround mode), it may disable additional monitors.

Next step:

• Right-click on desktop > Nvidia Control Panel > Display > Set up multiple displays.

• Make sure no displays are cloned/mirrored.

• Try enabling all three from there, not just Windows settings.

 

3. Faulty Display Output on GPU:

While all monitors work individually or in pairs, the third DisplayPort output on the GPU might be faulty or disabled in firmware.

Next step: Try a different combo:

• DP1 + DP2 + HDMI

• DP1 + HDMI + DP3

• HDMI + DP2 + DP3
  If one specific port always fails, the issue may be hardware-related.

 

4. Firmware/BIOS Lockdown:

Although rare, some OEM BIOSes may include firmware restrictions on how many displays can be output by the GPU. There’s no known public documentation from HP confirming a limitation on this model.

Next step:

• Check for a BIOS update here: on the HP support page for GT15-1940nd.

• Review any BIOS settings related to PCIe, graphics device priority, or multi-monitor support (though you’ve likely already done this).

---

Workaround Validity:

Your plan to use a StarTech USB-to-DisplayPort (DisplayLink) adapter is sound as a temporary workaround. It should allow the third monitor to function — but with a slight performance tradeoff, especially in gaming or video playback on that screen.

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Final Thoughts:

• This system should support 3 monitors natively via the RTX 4070 GPU.

• The behavior you're seeing is not expected or standard and suggests a possible HP-specific GPU variant, faulty output, or driver conflict.

• If your GPU turns out to be a locked-down OEM variant and you desire triple-monitor gaming support, you might consider replacing it with a retail RTX 4070 (or another GPU with known full-port support).

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Please let me know the results of the GPU-Z check or Nvidia Control Panel tests, and I’d be glad to further assist based on what’s found.

Kind Regards,

NonSequitur777

[kimyoun34]

Thanks for the detailed breakdown! Since the RTX 4070 normally supports 3+ displays, this might be an HP-specific firmware or BIOS limitation. Your USB DisplayLink workaround is a smart temporary fix, but I’d recommend checking with HP support directly about GPU output limitations on your specific model.