Additional GPU not Detected

Additional GPU not Detected- The Best Solutions

Are you one of those people who use multiple GPUs at once? Well, then you obviously face tons of GPU-related problems day in and day out. I know how frustrating it gets at those times.

But the most annoying thing is when the GPU is not even detected! So, what should you do if your PC shows the message, “additional GPU not detected”?

First of all, you should check your PCIe slots and cards manually for any problems. If Windows still fails to detect it, check your BIOS settings and look for any changes. Often the BIOS can be the culprit for such issues. Lastly, don’t forget the power supply as it can cause this issue too.

While these fixes may seem adequate for you, they’re actually not. Because there is a lot more to discuss.

So, sit tight and follow along!

Three Quick Fixes

It’s really hard to tell the actual problem regarding the GPU not detecting. But still, there are some general troubleshooting that can help. That’s what I want to discuss here. 

So, let’s check those troubleshooting methods.

GPU Check

A very basic but effective thing to do when GPU is acting up is to check the drivers. First of all, open the casing and check the drivers if they are fine. Check for any dislocation of your cards and positioning with the PCIe x16 lane.

Another good practice is to reinstall the card in another slot. By doing that you’ll know whether it’s your GPU’s problem or motherboard’s. Also, while checking that, make sure you’re on the latest driver software.

BIOS Settings & Update

Did you think only checking the cards is enough? Guess what, even your BIOS settings can cause this problem. Sometimes, your bios won’t be able to detect your GPU. This can restrict GPU from downclocking.

What to do when GPU is not detected in BIOS?

Check your BIOS settings and find the IGPU option. Choose the one for a single monitor if you’re using one display. Also, look for PCI-e settings and try the different options.

Power Supply Management

Often, there might be issues with the power supply unit when you use multiple GPUs. Because your power supply might not be powerful enough to support the whole system. That’s why it’s important to manage your power supply if you’re using additional GPUs.

Check the power rating and the average power needed for your GPUs. If the numbers don’t match, you may need to change the supply. 

So, don’t just blindly believe those full-speed running GPU fans. Test them all and be certain.

While these are the most effective solutions, there are more specific solutions too! I’ll try to guide you through those from here. 

So, let’s start with the 2nd GPU issue.

What’s Causing My 2nd GPU Not Detected Problem?

The 2nd GPU issue can be caused by either poor PSU or positioning. Sometimes reinstalling it in another slot can solve this issue. Then again, the Alpha male connection can be the culprit as well.

To solve this issue, check the power cables and the headers thoroughly. Also, PSU has to be connected to the mainframe firmly.

Lastly, try installing the newest drivers to be sure. These troubleshooting methods should solve your 2nd GPU issue.


For the best 2x GPU support, motherboards with 2 GPU slots are better than using PCIe. Now, you might question the quality of all the available motherboards out there with 2 GPU slots. And we’re here to help you find out the best-performing motherboards.

From our extensive research, we have narrowed our list down to 3 particular motherboards. Not only do they have 2 slots for GPU connection, but they are also the best of the best. Let’s have a look at them:

GIGABYTE Z390 AORUS PRO Supports 9th and 8th zEnIntel Core Processor
Smart Fan 5 feature
Dual Channel non ECC unbuffered DDR4
Add to Cart
MSI MPG X570 GAMING PRO CARBON WIFI MotherboardSupports 2nd and 3rd Gen AMD Ryzen Processors
Audio Boost 4 Technology
MSI’s Core Boost Feature
Add to Cart
ASUS Prime Z390-P LGA1151 MotherboardFor 9th and 8th Zen Intel Core Processor
8 Channel HD gaming audio
OPtimem II tech memory enhancements
Add to Cart

And the best thing is, you can get them for under $400! Not bad for motherboards that have so much to offer!

How to Fix 3rd GPU Not Detected Issue?

The game has been leveled up a notch and it’s a 3 GPU system now. If you’re not into mining, then you probably don’t need 3 GPUs at once. In the case of the GPU detection problem, there’s a common problem among many users.

It’s the 4 decoding option in BIOS. You have to enable that option if you want to use more than 2 cards. But some motherboards might not have this “4G decoding enable” option. Instead, you’ll find “Legacy OpROM” for PCI ROM. You have to switch it on.

Then, you’re PC will have no problem using three graphics cards together.

A Quick Solution to 4th GPU Not Detected Problem

For your mining purposes, 4 graphics cards may prove to be the best.

But what if your 4th one does not show up? How to detect GPU number 4? Let’s check out.

The problem with 4 cards is that there can be a riser issue. If your graphics riser is faulty, you’ll not be able to use all of your cards at once. You may still be able to use 2 or 3 cards though. To solve the issue, you should replace your GPU riser adapter card.

Another important thing to add. You can try removing and reinstalling the drivers after rebooting. It also proved to be a great way to solve this issue for some.


Fixing 5th GPU Not Detected Problem

Usually, the 5th GPU detection problem can be solved by the previously mentioned troubleshooting. However, there’s a prominent fix that will get priority. And that is the BIOS settings.

In the settings, you’ll see a CSM launch option. You have to enable it for mining. After enabling it, change it to UEFI & Legacy ROM setting and boot your PC. This option is quite similar to enabling the 4G decoding system.

Once you’re done with that, start your PC and you should have your 5 GPUs listed. 

6th GPU Not Detected? Here’s A Way to Solve It!

Now this one is a bit tough and weird at the same time. Because sometimes it’s not the fault of the hardware but the software. Let me explain.

If you’re having trouble with the 6th GPU, install DDU and run it in safe mode. After that, remove your GPU drivers and reinstall them to the latest version. If this troubleshooting does not work, you might have to buy another Windows key.

You can use this method to solve your 7th GPU not detected problem too! They tend to have more or less the same issues if you look closely. So, that’s everything you gotta need to fix your graphics card issues.


Is It Possible to Run 2 GPUs without SLI?

Yes, it’s quite possible to run 2 GPUs without any SLI on your computer. Even they don’t have to be from the same manufacturer as AMD or Nvidia. The non-crossfire framework can be used with both integrated and dedicated GPUs. So, you can wield those dual-GPU setups without worrying about SLI.

Is It Okay to Install 2 GPU on Any Motherboard?

Yes, it’s completely fine to Install dual or multiple GPU on most motherboards. You just have to make sure there are enough PCIe slots to install your GPUs. These setups won’t necessarily require SLI. But if you wish to use SLI, then you have to use graphics cards of the same model. 

How to Fix 8th GPU not Detected by Windows Issue?

First, check whether your PCI-E lane is causing the problem or not. If you use a PCIe-to-USB adapter, check that thoroughly too. In case of PCI-E causes the problem, take out the installed GPUs. Then, use M.2 PCIe or USB adapter to put them together. Reboot and check if your GPU is working.


I think you’re now well-educated on the whole “additional GPU not detected” issue. Now, you will be able to solve it all by yourself.

Still, the comments are open for you to reach out to.

So, go ahead and turn up the raw power of your GPUs!

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