TRX40D8-2N2T issues with 4 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=113435
Printed Date: 15 Jan 2026 at 4:49am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: TRX40D8-2N2T issues with 4 GPUs
Posted By: ukrolelo
Subject: TRX40D8-2N2T issues with 4 GPUs
Date Posted: 15 Jan 2026 at 1:33am
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Greetings, I have a problem with TRX40D8-2N2T Asrock TRX40D8-2N2T AMD Ryzen Threadripper 3960X 8x MTA18ASF4G72AZ-3G2B1 (ECC UDIMM) by Micron (2666) 2x Nvme 3x hdd Disabled 10G ethernet, 4G enabled, srv enabled 3GPUs are working no problem, but when i put riser(non shielded) to the x8 open connector and put 4th GPU it is going through boot loop (df,36,03,46,de,ad,df,36,03,46,de,ad,df,36,....) and not booting or in windows shows the 4th GPU with error 12 (This device cannot find enough free resources that it can use) From my calculation the pcie lanes should be enough, or i'm doing something wrong? Maybe the problem is non shielded riser? Anybody with 4x GPU experience can explain? |
Replies:
Posted By: Xaltar
Date Posted: 15 Jan 2026 at 1:52am
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It could be a number of things, AFAIK D4/D5 POST codes are where you should be getting stuck if it's resources. A code only indicates an issue if it's stuck and the system has stopped responding/progressing through POST. A loop is trickier to figure out, cycling codes mean nothing, only the last one before the cycle repeats. So if it's cycling df, 36, 03, 46, de, ad then AD would be the one that triggered the loop. The problem is, AD isn't a code with any meaning, AA usually flashes when the OS begins to load and ASRock's DrDebug code list makes no mention of anything past AA (AB, AC etc). It could be the riser cable, it may be having issues pushing enough power to the GPU. You will also want to check your UEFI for PCIe slot options, there may be a menu there that allows you to select how the lanes are split up. If it's set for 3 occupied slots and allocating all lanes already that could be the issue. I have only ever tried getting 3 GPUs going on my 2950x so I am afraid you are in uncharted waters where it comes to my experience. On top of that you are using a server grade (ASRock Rack) board so the BIOS will be wildly different. Hopefully something I mentioned puts you on the right track, failing that you can open a support ticket with ASRock Rack: https://event.asrockrack.com/tsd.asp" rel="nofollow - https://event.asrockrack.com/tsd.asp ------------- 
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Posted By: ukrolelo
Date Posted: 15 Jan 2026 at 2:03am
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:-P Thank you. Will try to find shielded riser to test out and report back! <3 P.S. i changed all pcie in bios to x8x8,x8x8,x8x8,x8 after that stop booting, no other lane splits options in the bios... I hope that i would not be forced to remove 2x nvme from the MB.... I tryed even with 1 nvme, still was not working. |