3090 FE not working in 3rd PCIe Slot

[Ali87]

I've been scratching my head on whats going on here.

 

Setup:

i9-10900k @ 3.7ghz

Asus ROG Strix z590-e Gaming Wifi Motherboard

3x 3090 FE w/EKWB Waterblocks and active backplates

M.2 in 2nd available slot

1500w PSU

 

When plugging in GPUs in Slot 1 and Slot 2 everything boots up fine. However, when plugging in the third 3090 in Slot 3, I get Q code 62 with white LED. I've checked to make sure the GPU #3 is firmly plugged into the slot, and power cords are plugged in. Tested the cord, all cords are good.

 

Computer won't boot up if I have GPU 3 power plugged in.

 

Thoughts?

 

 

[Robertshipley]

hardware conflict 

[Ali87]

5 minutes ago, Robertshipley said:

hardware conflict 

Can you please explain? I don't understand what this means?

[Robertshipley]

Something else on you computer is all ready using the resources for your third card

[Robertshipley]

 check your error logs in windows it show what irq are in conflict.  Also check device manager 

[GuiltySpark_]

That CPU has 16 lanes of PCIe. According to this from your manual, if you try to use two GPU's and one M.2 in the M.2_2 slot, that's 16 lanes used. I am not an expert here but that was just what I found using your manual.

 

That's not really a system designed for that many GPU's. 

 

[Robertshipley]

Lol wished I could afford one 3090

[mr fobs]

If you want 3 3090s (why??) you will need 5950x or Threadripper CPU more than likely. Even then, why??

[GuiltySpark_]

Just now, mr fobs said:

If you want 3 3090s (why??) you will need 5950x or Threadripper CPU more than likely. Even then, why??

Poor decisions in the interest of mining. 

[mr fobs]

Just now, rickeo said:

Poor decisions in the interest of mining. 

There needs to be a sad react.

[Ali87]

6 minutes ago, rickeo said:

That CPU has 16 lanes of PCIe. According to this from your manual, if you try to use two GPU's and one M.2 in the M.2_2 slot, that's 16 lanes used. I am not an expert here but that was just what I found using your manual.

 

That's not really a system designed for that many GPU's. 

 

 

I think I understand. In theory would a workaround be to run M.2 on M.2_4 as SATA mode and run PCIe #2 & 3 at x4 and PCIe #1 at x8?

[Ali87]

Figured it out based on the feedback. The problem as this thread noted, was a hardware conflict - not enough PCIe lanes to go around between the 3x 3090s and the m.2.

 

The workaround to get all 3 3090s working and for the system to boot was to run all PCIe lanes as gen 1 to slow them down so there were enough resources to go around. This motherboard clearly isnt built for mutliple high powered GPUs. Lesson learned.

 

Thank you.