3080 with Gigabyte B650M shuts off when 2nd PCIe power line plugged in

[AIG_MFG]

My pc shuts off when I plug in the 2nd PCIe power cable into the 3080 10GB card. I replaced the power supply so that's not it. I can plug in the first PCIe cable, with no power going to the unit, when the second is plugged in the entire system shuts off. Wondering if its a BIOS issue or the card. Help have been down a month.

[Bill_To]

Greetings @AIG_MFG 

Welcome to the HP Forum.

Is the 3080 using the Nvidia 12 pin PCIe power adapter? A 320 watt TDP 3080 needs two (separate) 150 watt eight pin PCIe power connections from the PSU.

It sounds like a graphics card connector problem or a graphics card system board problem if you have tried a different PSU and you are using different PCIe power cables.

Is it possible to try a different graphics card?

But, why is the system shutting down when you connect the power supply's second eight pin PCIe cable to the graphics card? 

You should not be connecting anything (component or MB/component power connectors) directly or indirectly to the MB when the PC is running.

HP consumer PCs don't have a PSU on/off switch. So, you need to unplug the PC from AC power. Then depress and hold down the PC's power button a few times to drain residual MB power.

Regards

[AIG_MFG]

If I plug in the second PCIe prior to launch the system will not turn on. Could it be be BIOS, they need to be updated?

[AIG_MFG]

Initially I was using one PCIe cable, and plugging both 6 pin plugs into the slots. After the system stopped I tried to use the hard wired PCIe and the modular PCIe. When both are plugged in, the system won't stop. 

I'll try unplugging the PSU and holding the power button.

[Bill_To]

Greetings @AIG_MFG 

I can't get a handle on exactly what is happening when you try to use the 3080. It's very difficult to solve this type of problem, using the info you are providing, in a Forum. 

You mentioned connecting two six pin PSU connectors to the 3080. Most 3080s require two eight pin PSU connections.

The PC won't start in one instance per your previous response. Now you are stating the PC won't stop.

You would have to go to Gigabyte, using your specific MB product name, to get a recent BIOS update for a Gigabyte MB.

Try a different graphics card in your PC. Or try the 3080 in a different PC.

Maybe a local PC Tech can sort this out.

Regards

[AIG_MFG]

I mis-spoke they are 8 Pin.

The PC won't start if the second 8 PIN PCIe slot is plugged in.

I will update on the BIOS.

[Bill_To]

Greetings @AIG_MFG 

Do you have a HP PC?

Your PC has a Gigabyte AM5 B650M MB.  The 3080 requires a minimum 700 watt PSU.

The Ryzen CPU would have integrated graphics. The MB should have HDMI or Display Ports out on the rear MB I/O.

Can you run the PC using integrated graphics?

Regards

[AIG_MFG]

Not a HP computer. Its purpose built.

I can run the integrated graphics and are using that way currently.

The motherboard does have HDMI, which I use to plug in the wide screen.

[Bill_To]

Greetings @AIG_MFG 

Thanks for the info.

Nothing is certain in life. I don't think you have a BIOS problem. 

Have you changed any BIOS settings? Reset the BIOS to defaults. A BIOS update would reset the BIOS to factory settings.

When a PC runs okay until a specific component is installed usually points to a component problem.

You have to troubleshoot to find the bad part.

You could have a 3080 problem, a MB  x16 slot problem, or a power supply problem.

You tried two PSUs and see the same issue so it seems like the PSU may not be the problem.

Does the Gigabyte MB have a second PCIe x16 slot? Try the 3080 in this slot if the MB has this.

You would have to try a different graphics card in your MB or try the 3080 in a different PC.

Regards 

[AIG_MFG]

We tried it on another PC, and got the same result. It must be the GPU, that is the constant. I bought the unit less than a year ago... What next?