Question New GPU is not detected by computer when plugged into a PCIe slot ?

[Loidkrone]

I have made a build with specifications i5-12400, Gigabyte GTX 1080, ASUS PRIME B660M-K D4, Corsair RM650x (2016, from old setup) and the GPU is not at all detected by the computer, not even in Device Manager or BIOS. It works when using a m.2 to PCIe adapter, and I have tested other GPUs in the same slot to no avail. The motherboard only has one PCIe x16 slot.

I have tested 3 other motherboards also. Two MSI motherboards don't POST no matter what I do and another ASUS board has the exact same problem.

I have also tested using a different no-name power supply that I had laying around and still had the same problem. Any suggestions?

 

[Aeacus]

Looks like a dead GPU.

It works when using a m.2 to PCIe adapter

In this case, only 4x lanes of PCI-E are used, and not the full 16x lanes GPU can use.

Most likely, the issue is somewhere after the 4x PCI-E lanes, in terms of GPU PCI-E pins.

You can send the GPU in for repairs, since it does show some life. Or RMA the GPU when it has warranty.
For repair shops, Northridge Fix is one of the better ones,
link: https://northridgefix.com

While Northridge Fix is USA based, they accept international shipping and can do repairs worldwide. (If you're located outside of USA.)

Alex, founder and owner of Northridge Fix, often posts electronics repair videos to his Youtube channel, that i find interesting and informative to watch.

Channel: https://www.youtube.com/@NorthridgeFix/videos

E.g MSI GTX 1080 repair;

View: https://www.youtube.com/watch?v=2V5FhaRzVoM


They also sell all and every kind of equipment to do with electronics fixes. Soldering stations, microscopes, flux, capacitors, mosfets, connectors etc.

 

[Loidkrone]

Looks like a dead GPU.


In this case, only 4x lanes of PCI-E are used, and not the full 16x lanes GPU can use.

Most likely, the issue is somewhere after the 4x PCI-E lanes, in terms of GPU PCI-E pins.

You can send the GPU in for repairs, since it does show some life. Or RMA the GPU when it has warranty.
For repair shops, Northridge Fix is one of the better ones,
link: https://northridgefix.com

While Northridge Fix is USA based, they accept international shipping and can do repairs worldwide. (If you're located outside of USA.)

Alex, founder and owner of Northridge Fix, often posts electronics repair videos to his Youtube channel, that i find interesting and informative to watch.

Channel: https://www.youtube.com/@NorthridgeFix/videos

E.g MSI GTX 1080 repair;

View: https://www.youtube.com/watch?v=2V5FhaRzVoM


They also sell all and every kind of equipment to do with electronics fixes. Soldering stations, microscopes, flux, capacitors, mosfets, connectors etc.

Forgot to mention, but the GPU did work completely on an older setup, and I've tested multiple other GPUs in the same slot and none worked.

 

[Aeacus]

and I've tested multiple other GPUs in the same slot and none worked.

Besides GPU, MoBo PCI-E x16 slot is also done for.

but the GPU did work completely on an older setup

All hardware will die at some point. Often without apparent reason. GTX 1080 is 9 year old GPU and it (partly) dying isn't that much of a surprise.

 

[Loidkrone]

Besides GPU, MoBo PCI-E x16 slot is also done for.


All hardware will die at some point. Often without apparent reason. GTX 1080 is 9 year old GPU and it (partly) dying isn't that much of a surprise.

Alright. I was slightly concerned since the PCIe slot didn't even work with the other known working GPUs (before I'd even tried the 1080) and the motherboard is completely new.

 

[80251]

I once had a similar issue w/an old AMD 9700 Pro. My whole Haswell-e system would fail to boot w/the 9700 Pro installed. It turns out the 9700 Pro is PCIe 2.0 compatible and will only work at PCIe 2.0 speeds, which I had to manually set in the BIOS. Your GTX 1080 is PCIe 3.0 compatible while I believe your PCIe 16 slot is PCIe 4.0.

 

[Loidkrone]

I once had a similar issue w/an old AMD 9700 Pro. My whole Haswell-e system would fail to boot w/the 9700 Pro installed. It turns out the 9700 Pro is PCIe 2.0 compatible and will only work at PCIe 2.0 speeds, which I had to manually set in the BIOS. Your GTX 1080 is PCIe 3.0 compatible while I believe your PCIe 16 slot is PCIe 4.0.

Thanks. I'll try this.

 

[Aeacus]

PCI-E revisions are both forwards and backwards compatible. So, this shouldn't be an issue.

E.g PCI-E 4.0 GPU (RTX 4090) is very well capable of running in PCI-E 1.1 slot, albeit at reduced performance.
Further reading if interested: https://www.techpowerup.com/review/nvidia-geforce-rtx-4090-pci-express-scaling/28.html

 

[triplex1]

Thanks. I'll try this.

I would say that the currents of the Corsair RM650x are not enough to start your system.
Can you list all the parts one by one from the old system that the 1080 card was running?

 

[triplex1]

In no case does the PCIe port have anything to do with the card.
Whether it is 4.0 or 3.0 the card should work, so it has nothing to do with the motherboard

 

[80251]

In no case does the PCIe port have anything to do with the card.
Whether it is 4.0 or 3.0 the card should work, so it has nothing to do with the motherboard

Really? Try plugging an AMD 9700 Pro (a PCIe 2.0 part) into a PCIe 3.0 or PCIe 4.0 slot and see what happens.

 

[COLGeek]

What PCIe version is set in the BIOS? Manually lowering may be needed.

 

[Aeacus]

I would say that the currents of the Corsair RM650x are not enough to start your system.

That's wrong info.

On initial power-on, system (GPU) WILL NOT draw maximum amount of power it possibly can. More like ~50W total across the system, if even that.

GTX 1080 is 180W GPU and 650W PSU is more than enough for it. Not to mention that Corsair RMx-series is good quality PSU.


Or explain me this; PSU suggested for GTX 1080 is 450W unit,
specs: https://www.techpowerup.com/gpu-specs/geforce-gtx-1080.c2839
or 500W unit by official specs: https://www.nvidia.com/en-ph/geforce/products/10series/geforce-gtx-1080/

How, in your logical world, the GPU is supposed to operate on 450W/500W unit, if, by your words, even 650W unit isn't enough? 🙄

 

[Loidkrone]

I would say that the currents of the Corsair RM650x are not enough to start your system.
Can you list all the parts one by one from the old system that the 1080 card was running?

i5-6500, ASUS Z170 PRO GAMING, same 1080 and RM650x, 16GB HyperX-2400 RAM

 

[Loidkrone]

I once had a similar issue w/an old AMD 9700 Pro. My whole Haswell-e system would fail to boot w/the 9700 Pro installed. It turns out the 9700 Pro is PCIe 2.0 compatible and will only work at PCIe 2.0 speeds, which I had to manually set in the BIOS. Your GTX 1080 is PCIe 3.0 compatible while I believe your PCIe 16 slot is PCIe 4.0.

This unfortunately did not work with multiple GPUs.

 

[Loidkrone]

What PCIe version is set in the BIOS? Manually lowering may be needed.

Was set to Auto as default but did not work on any setting

 

[80251]

R U sure your GTX 1080 actually works? If you can't get any video card to work in that PCIe slot then maybe that PCIe slot is dead and it's time to RMA that motherboard.
I remember once I had a ridiculous situation where I couldn't plug my 1080ti back into the PCIe 16 lane slot in my motherboard -- and I had taken it out of the slot only 10 minutes before. It turned out that because the slot was black it perfectly hid the snipped, black, ziptie that had fallen into it. It was maddening.

 

[Loidkrone]

R U sure your GTX 1080 actually works? If you can't get any video card to work in that PCIe slot then maybe that PCIe slot is dead and it's time to RMA that motherboard.
I remember once I had a ridiculous situation where I couldn't plug my 1080ti back into the PCIe 16 lane slot in my motherboard -- and I had taken it out of the slot only 10 minutes before. It turned out that because the slot was black it perfectly hid the snipped, black, ziptie that had fallen into it. It was maddening.

I've tested the slot with multiple GPUs that should work and have worked previously, but I'll test it later with a GPU that definitely works. I don't think it's a motherboard problem because I've already had this exact problem with another ASUS motherboard, and this board is completely new.

 

[BFG-9000]

Really? Try plugging an AMD 9700 Pro (a PCIe 2.0 part) into a PCIe 3.0 or PCIe 4.0 slot and see what happens.

This would be difficult to do, considering the ATI 9700 Pro was native AGP and I've never heard of one with a PCIe bridge chip.

The R300 based 9500 and 9700 series were the last AGP cards compatible with 3.3v signaling (so could work in AGP 1.0 boards), and while these were claimed to be AGP 8x they would rarely work with 1.5v-only boards and definitely did not work at 0.8v like successors R350/R360 based 9800 or RV350/RV360 9600 could (but those would not work on AGP 1.0 boards). So that may explain your remembering it not working in some boards. AGP was a lot less backwards-and-forwards compatible than PCIe.

Hey at least the bus speed stayed at 66MHz unlike VLB, although FSB overclocking a board without PCI lock could result in AGP being overclocked to the default 100MHz of PCIe

 

[triplex1]

find other psu and try , since 2016 we are talking about 9 years, even if it has suffered for a while, its performance has dropped, the processor you have max boosted to 120 watts, how do you expect your system to start?

 

[80251]

This would be difficult to do, considering the ATI 9700 Pro was native AGP and I've never heard of one with a PCIe bridge chip.

The R300 based 9500 and 9700 series were the last AGP cards compatible with 3.3v signaling (so could work in AGP 1.0 boards), and while these were claimed to be AGP 8x they would rarely work with 1.5v-only boards and definitely did not work at 0.8v like successors R350/R360 based 9800 or RV350/RV360 9600 could (but those would not work on AGP 1.0 boards). So that may explain your remembering it not working in some boards. AGP was a lot less backwards-and-forwards compatible than PCIe.

Hey at least the bus speed stayed at 66MHz unlike VLB, although FSB overclocking a board without PCI lock could result in AGP being overclocked to the default 100MHz of PCIe

You're right it was an AMD 6950 flashed to a 6970, but still, give it a try and see if you can get a PCIe 2.0 compatible card to work in a PCIe 3.0 or PCIe 4.0 because it didn't work for me unless I went in the BIOS and set the PCIe slot to PCIe 2.0.

 

[COLGeek]

You're right it was an AMD 6950 flashed to a 6970, but still, give it a try and see if you can get a PCIe 2.0 compatible card to work in a PCIe 3.0 or PCIe 4.0 because it didn't work for me unless I went in the BIOS and set the PCIe slot to PCIe 2.0.

To be frank, that "flashing" could have contributed to your past particular problem.

Other than the aspect of the OP changing BIOS settings, not really applicable to this issue.

 

[Aeacus]

the processor you have max boosted to 120 watts, how do you expect your system to start?

Did you not read what i wrote above? 🤔 CPU, GPU etc WILL NOT draw the maximum power on system startup!

65W CPU (117W on turbo) + 180W GPU + ~100W for the rest of the system = ~400W total on max load (e.g during benchmarking).

 

[triplex1]

Did you not read what i wrote above? 🤔 CPU, GPU etc WILL NOT draw the maximum power on system startup!

65W CPU (117W on turbo) + 180W GPU + ~100W for the rest of the system = ~400W total on max load (e.g during benchmarking).

I insist that the power supply is at fault.
I know how many watts it has, don't lecture me.

 

[Aeacus]

I insist that the power supply is at fault.

If so, then explain this:

and the GPU is not at all detected by the computer, not even in Device Manager or BIOS. It works when using a m.2 to PCIe adapter

Since when issue would be with PSU, OP wouldn't be able to power on the PC at all, to access BIOS, boot to OS (for Device Manager) and even use M.2 to PCI-E adapter which makes their GTX 1080 to operate fine.