AMD Motherboards - Taichi x399 and more than 5 gpus

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Taichi x399 and more than 5 gpus

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=15242
Printed Date: 09 Aug 2025 at 1:54pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Taichi x399 and more than 5 gpus

Posted By: P99t
Subject: Taichi x399 and more than 5 gpus
Date Posted: 19 Aug 2020 at 12:33am

Hello , i am trying to lunch my system on more than 5 gpu
My build is :
CPU : Threadripper 1920X 12 cores 3.50 GHz
RAM : 8 x 16 GB Gskill 3200. (128 gb total)
GPU : 7 x GTX 1080 TI 11 GB
PSU : 3 x Corsair HX1200i .
BIOS version : 3.60

I am using PCI-Express card model : EUX1-04 to convert 16x PCIe to 4 1x PCIe to able to connect all my gpus.

1 gpu is connected directly to PCIe x 16 slot (Slot 1at the top of motherboard)

No i can post and lunch system only with 5 gpus . And it's working perfectly. (BTW It's not mining , i am building for rendering)

When i am connecting 6 gpus , bios is not posting , it's going in a rebooting loop . And its rebooting at the end of post code list something around 92 - 99 coz after that screen with Asrock logo should appear.
After some bios tweking , disabling hardware i don't need in bios i managed to post and Windows 10 64 bit is loaded ! But still it see only 5 gpus. :(
I was looking forums and founded that enabling function called "above 4g decoding" could help , but unfortunately i can't find it in bios . Can some one help me ?

Replies:

Posted By: kerberos_20
Date Posted: 20 Aug 2020 at 9:05pm

hi, u have to disable CSM compatibility mode first to get acess to above 4G device mapping

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Posted By: manodzit
Date Posted: 22 Nov 2020 at 10:56pm

Hi

Would you be so kind to elaborate on your set a bit more, if possible some pictures would be great!

thanks
mano

Posted By: manodzit
Date Posted: 22 Nov 2020 at 10:57pm

P99t wrote:

Hello , i am trying to lunch my system on more than 5 gpu
My build is :
CPU : Threadripper 1920X 12 cores 3.50 GHz
RAM : 8 x 16 GB Gskill 3200. (128 gb total)
GPU : 7 x GTX 1080 TI 11 GB
PSU : 3 x Corsair HX1200i .
BIOS version : 3.60

I am using PCI-Express card model : EUX1-04 to convert 16x PCIe to 4 1x PCIe to able to connect all my gpus.

1 gpu is connected directly to PCIe x 16 slot (Slot 1at the top of motherboard)

No i can post and lunch system only with 5 gpus . And it's working perfectly. (BTW It's not mining , i am building for rendering)

When i am connecting 6 gpus , bios is not posting , it's going in a rebooting loop . And its rebooting at the end of post code list something around 92 - 99 coz after that screen with Asrock logo should appear.
After some bios tweking , disabling hardware i don't need in bios i managed to post and Windows 10 64 bit is loaded ! But still it see only 5 gpus. :(
I was looking forums and founded that enabling function called "above 4g decoding" could help , but unfortunately i can't find it in bios . Can some one help me ?

Hi

Would you be so kind to elaborate on your set a bit more, if possible some pictures would be great!

thanks
mano

Posted By: ringo196
Date Posted: 05 Feb 2021 at 4:35pm

Did you ever solve this? I'm trying to do have 6-8 cards too and also getting stuck on 5 cards. I found above 4g decoding, but it isn't helping.