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Asrock X399 Taichi + 1950x boot loop

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=8918
Printed Date: 31 Oct 2025 at 3:41pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com


Topic: Asrock X399 Taichi + 1950x boot loop
Posted By: Overloader
Subject: Asrock X399 Taichi + 1950x boot loop
Date Posted: 13 Jun 2018 at 4:15am
" rel="nofollow - Hello, I've the boot loop problem with the following components:
  • ASRock X399 Taichi (BIOS 2.00)
  • Corsair Vengeance LPX 128GB (8x16GB) DDR4 3600MHz C18 (CMK128GX4M8X3600C18)
  • AMD ThreadRipper 1950x
  • EVGA GeForce GTX 1080 Ti SC Black Edition Gaming 11GB GDDR5X
  • 1.0 TB Samsung SSD 960 Pro SSD
  • be quiet! DARK POWER PRO 11 1200W
The Dr Debug codes appears in the following order (as far I can see) and then it starts from the beginning over and over again:
00 Not used
A5 SCSI Reset
A6 SCSI Detect
64 CPU DXE initialization (CPU module specific)
A2 IDE Detect
FC Reserved for future AMI error codes
3E Post-Memory PCH initialization (PCH module specific)
88 OEM DXE initialization codes
67 CPU DXE initialization (CPU module specific)
d5 No Space for Legacy Option ROM
02 IDE Detect
d1 System Agent initialization error
14 Pre-memory CPU initialization (CPU module specific)
15 Pre-memory System Agent initialization is started
6E  System Agent DXE initialization (System Agent module specific)
C0 OEM BDS initialization codes
88 OEM DXE initialization codes
d3 Some of the Architectural Protocols are not available
C1 OEM BDS initialization codes
65 CPU DXE initialization (CPU module specific)
C9 OEM BDS initialization codes
68 PCI host bridge initialization
Cd OEM BDS initialization codes
61 NVRAM initialization
63 CPU DXE initialization is started
67 CPU DXE initialization (CPU module specific)
15  Pre-memory System Agent initialization is started
05 OEM initialization before microcode loading
22  OEM pre-memory initialization codes
12 Pre-memory CPU initialization (CPU module specific)
54 Unspecifi ed memory initialization error
33 CPU post-memory initialization. Cache initialization
55 Memory not installed
36 CPU post-memory initialization. System Management Mode (SMM) initialization
4F DXE IPL is started
60 DXE Core is started
61 NVRAM initialization
8A OEM DXE initialization codes
89 OEM DXE initialization codes
55 Memory not installed
90 Boot Device Selection (BDS) phase is started

What I've tried so far without success and no Dr Debug code change:
  1. Use only 1 RAM module in different slots
  2. Removed GPU (no GPU error code, same behaviour)
  3. Removed SSD
  4. Tried SSD in differend M2 slots
  5. Reinstalled CPU three times to be sure it's correct installed
  6. Tried different BIOS versions from 1.5 to 2.0 and 1.91E (via flashback)
  7. Tried other RAM Corsair Vengeance LPX 32GB (4x8GB) DDR4 2400MHz (CMK32GX4M4A2400C14), also only 1 module
  8. Tried another GPU
Any ideas what's going on?
  1. Is the mainboard defect?
  2. What does the Dr Debug codes mean so far (worjs the CPU, works the mainboard, works the RAM)?
  3. Why I can't get into the bios or see anything on the display (via HDMI)?


Replies:
Posted By: datonyb
Date Posted: 13 Jun 2018 at 5:04am
usual suspects

insert 24 pin pwr cable
then the 8 pin cpu/eps
then the EXTRA 4 pin cpu/eps pwr (make sure this isnt a pcie pwr)

and try a different cable for display eg display port


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[url=https://valid.x86.fr/jpg250][/url]

3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold

Posted By: Overloader
Date Posted: 13 Jun 2018 at 5:18am
Thank you for your answer. The power cables (all 3) are connected right. The fourth (right botton side) for 4 PCI-E GPUs is not connected, but it does not make a difference. I will try display port tomorrow, but I guess it's not that problem.

Posted By: orionbg
Date Posted: 13 Jun 2018 at 2:27pm
If you ask me, you are using the wrong RAM for Threadripper! Corsair does not have many Samsung B dies based RAM modules...
But most probably you have either a bad CPU or Motherboard... Try changing one of those two and if there is no change, than the other component of the two is the bad one.


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Asrock X399 Taichi, AMD Threadripper 1950X, 32GB G.SKILL TridentZ RGB 3200MHz,
256GB Samsung PM961 nvme, 512GB Samcung 850 EVO, 512GB Intel 5400S,
GTX1080Ti FE, Lian-Li PC-O11WGX case, Custom W.Loop

Posted By: TANWare
Date Posted: 13 Jun 2018 at 3:00pm
I do know on first boot the system will memory learn and go for up to 5 loops in boot before allowing bios.

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x399 Taichi, 1950x, 32GB 3466 DDR4
2x500GB 960EVO,Asus 1080TI
http://www.pcambrosia.com/images/PassmarkEVO960_e.jpg" rel="nofollow - Passmark

Posted By: Overloader
Date Posted: 14 Jun 2018 at 3:56am
The Corsair CMK32GX4M4A2400C16 is on the QVL list of the Asrock X399, that's not the problem. I have wait for three minutes and the boot lopp still exists. The fans are spinning up and down. No screen on display port.

Posted By: TANWare
Date Posted: 14 Jun 2018 at 9:04pm
Video does not appear until after the bios successfully posts. The fact before restart of the loop it goes 55 (memory not installed) seems like it could be your issue.

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x399 Taichi, 1950x, 32GB 3466 DDR4
2x500GB 960EVO,Asus 1080TI
http://www.pcambrosia.com/images/PassmarkEVO960_e.jpg" rel="nofollow - Passmark

Posted By: Overloader
Date Posted: 29 Jun 2018 at 3:22am
I have used the AMD warranty (blazing fast replacement) and with a shiny new CPU it works like a charm. I wil never buy a sale return CPU via Ebay trader again. The 128 GB RAM are working also fine. RAM are working with 2933 MHz. 

Now it's tuning time :D

Posted By: datonyb
Date Posted: 29 Jun 2018 at 5:56am
so it was the cpu then

glad its sorted ,but you didnt tell us it was a iffy cpu purchased we might have helped better


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[url=https://valid.x86.fr/jpg250][/url]

3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold

Posted By: Overloader
Date Posted: 03 Jul 2018 at 3:15am
Sorry for that missing detail, but the reseller has written it was tested and is fully functional. Lessons learned.

Posted By: datonyb
Date Posted: 03 Jul 2018 at 5:22am
Originally posted by Overloader Overloader wrote:

Sorry for that missing detail, but the reseller has written it was tested and is fully functional. Lessons learned.


your only mistake was having faith in humanity ..................

ebay ...grrrrrrrrrrrr

you have to do the whole sherlock holmes on ever seller to even stand a chance of not getting fisted


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[url=https://valid.x86.fr/jpg250][/url]

3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold

Posted By: Xaltar
Date Posted: 03 Jul 2018 at 5:58am
When it comes to current gen parts, never buy used CPUs from an unknown source without the ability to actually see it working in person. Old CPUs that are outdated are usually fine, they are ex-upgrade parts and probably work. New ones are often only sold because the seller broke them and is trying to get some money back. People can be particularly unscrupulous Angry

Glad to see you have a running system now though Cool Thumbs Up


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