Question Help getting more than 3 GPU working on Gigabyte B450 AORUS Pro Wi-Fi

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Frenchy19951

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Mar 8, 2021
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I have a ryzen 3600X, my first 3 3080s work no trouble. My fourth 3080 and 3060 TI not being picked up in device manager. I've enabled 4G decoding, tried GEN1 & GEN2 pcie speeds. There's only 4 slots on this board and the first 3 slots recognized the cards one by one no issues. The fourth turns on but is not showing up in device manager. I've also put M.2 to USB/Riser in M.2 slot A but that also is not recognized. I am waiting on a PCI to 4 riser splitter to see if that changes anything.

This isn't my first rig, doing over 1.4 GH in my house but this one is giving me trouble. There are basically bare-bones bios settings in this board. I haven't changed any other settings or turned off anything in the bios. Only things I've done is enabled 4G decoding and tried GEN 1 & 2 speeds.

Any and all suggestions would be greatly appreciated.

RYZEN 5 3600X CPU
16 GB RAM
Windows 10 (I usually use hiveOS but get them working in Windows 1st)
2 1200 W Corsair PSU brand-new n both tested to work (PSU splitter)
4 3080s and 1 3060 TI (been tested and work with/by themselves)
1 256g SSD Silicon (all my rigs use these)
Show hidden devices is turned on but shows nothing
 
Last edited:
Furious_Styles said:
Yep, likely this.
Click to expand...
Please describe what you are talking about. I haven't been able to figure this out since I've been building my rigs. Multiple people have said this before and it's never ended up being the problem. What exactly are you guys describing and talking about in that article? What do you mean "Seems like you are trying to use more PCIe slots then the mobo supports or has bandwith for from what I can make of the info"

Thank you for helping
RYZEN 5 3600X CPU
16 GB RAM
Windows 10 (I usually use hiveOS but get them working in Windows 1st)
2 1200 W Corsair PSU brand-new n both tested to work (PSU splitter)
4 3080s and 1 3060 TI (been tested and work with/by themselves)
1 256g SSD Silicon (all my rigs use these)
Show hidden devices is turned on but shows nothing
 
Denpepe said:
Seems like you are trying to use more PCIe slots then the mobo supports or has bandwith for from what I can make of the info here https://www.gigabyte.com/Motherboard/B450-AORUS-PRO-WIFI-rev-1x/sp#sp
Click to expand...
Please describe what you are talking about. I haven't been able to figure this out since I've been building my rigs. Multiple people have said this before and it's never ended up being the problem. What exactly are you guys describing and talking about in that article? What do you mean "Seems like you are trying to use more PCIe slots then the mobo supports or has bandwith for from what I can make of the info"

Thank you for helping
RYZEN 5 3600X CPU
16 GB RAM
Windows 10 (I usually use hiveOS but get them working in Windows 1st)
2 1200 W Corsair PSU brand-new n both tested to work (PSU splitter)
4 3080s and 1 3060 TI (been tested and work with/by themselves)
1 256g SSD Silicon (all my rigs use these)
Show hidden devices is turned on but shows nothing
 
B450 does not have that many PCIE lanes available. I forget how many without looking it up. But you can't populate every slot with a graphics card and get it working every time. You might try an older Bios that had PCIE 4.0 but it was only one revision as far as I remember and your board may never have gotten it.
 
From the Gigabyte page:
  1. 1 x PCI Express x16 slot, running at x16 (PCIEX16)
    * Actual support may vary by CPU.
    * For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.
    (The PCIEX16 slot conforms to PCI Express 3.0 standard.)
  2. 1 x PCI Express x16 slot, running at x4 (PCIEX4)
    * The PCIEX4 slot shares bandwidth with the PCIEX1_1 and PCIEX1_2 slots. The PCIEX4 slot operates at up to x2 mode when the PCIEX1_1/PCIEX1_2 slot is populated. The PCIEX4 slot operates at up to x4 mode when both of the PCIEX1_1 and PCIEX1_2 slots are empty.
  3. 1 x PCI Express x16 slot, running at x1 (PCIEX1_2)
  4. 1 x PCI Express x1 slot (PCIEX1_1)
    (The PCIEX4 and PCIEX1 slots conform to PCI Express 2.0 standard.)
  5. 1 x M.2 Socket 1 connector for a wireless communication module (M2_WIFI)
    * B450 AORUS PRO WIFI includes the wireless communication module.
Click to expand...

PCIEX1_2 shares bandwidth with the 1x and 4x slots, one of those may be disabled with everything populated. You'll have to check under the BIOS settings (PCIe lane configuration) but it sounds like this setup might not be supported on that board. Possible that the board doesn't have this option in the BIOS. In that case you could try placing all of the cards on 1x risers and it (may) work, short of that you'll be out of luck.

As an aside, if you're doing things with external PCIe risers (mining or otherwise) make sure everything is secured to a chassis, sufficiently grounded, and don't use sata power connectors for risers - in other words, don't burn your house down or risk your hardware.
 
how are you plugging the GPUs into the board? direct or with risers? If direct, it may be a lane issue. I have a B450 board (msi) with seven GPUs but all on risers, so I only need a total of seven lanes.
 
applegrcoug said:
how are you plugging the GPUs into the board? direct or with risers? If direct, it may be a lane issue. I have a B450 board (msi) with seven GPUs but all on risers, so I only need a total of seven lanes.
Click to expand...
They are all on risers. How do you calculate the lanes that you need?
 
SamuelL421 said:
From the Gigabyte page:


PCIEX1_2 shares bandwidth with the 1x and 4x slots, one of those may be disabled with everything populated. You'll have to check under the BIOS settings (PCIe lane configuration) but it sounds like this setup might not be supported on that board. Possible that the board doesn't have this option in the BIOS. In that case you could try placing all of the cards on 1x risers and it (may) work, short of that you'll be out of luck.

As an aside, if you're doing things with external PCIe risers (mining or otherwise) make sure everything is secured to a chassis, sufficiently grounded, and don't use sata power connectors for risers - in other words, don't burn your house down or risk your hardware.
Click to expand...
They are all on risers and with Molex.
 
Frenchy19951 said:
How do you calculate this? Or where is it written in the specs? Sorry for being such rookie but CPU lanes configuration is one thing I haven't understood yet completely.
Click to expand...
Here is a great resource to get started PCIE lanes explained

It would take much more time for one of us to explain vs you doing some research and reading a article aimed at explaining it.
 
Frenchy19951 said:
They are all on risers and with Molex.
Click to expand...
ok, so what does your MB manual say about lanes? Are there any slots that share with a sata controller or the m2? Also, are you running the most up to date bios?

What about uefi? are you in uefi only mode or uefi and legacy?
 
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