Question Main Slot Won't Boot as PCIe 4.0.

Maikurosofuto

Commendable
Oct 24, 2019
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16
1,615
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After trying to narrow down the cause (https://forums.tomshardware.com/threads/windows-10-stuck-on-loading-dots.3745394/#post-22615583)
I've found how to reproduce it, simply setting in bios the first slot as auto or PCIe 4.0 will make my Windows unable to boot 99% of the time. It posts and when I manage to get into windows with PCIe 4.0 everything works fine, so I don't have any clue of what's happening, already replaced the MOBO and the same issue occurs.
Setting it to PCIe 3.0 or using the bottom PCIe slot, which is PCIe 4.0 x8 connected to the chipset, boots flawlessly.

I'm on Windows 11 right now, but that's not really relevant, just making clear because of the video title, the problem is exactly the same with Windows 10.
View: https://www.youtube.com/watch?v=IUvfobmBrC8


For me, it's either the CPU or a BIOS issue, but since it works flawlessly when I manage to boot, I can't really see how it's the CPU. Hope someone with a better experience/knowledge can help me out on this, thanks in advance.

My specs in case you have signatures disabled:
Ryzen 9 5900X
GALAX GeForce RTX 3070 SG
ASUS TUF Gaming X570-Plus
32GB (2x16) Corsair Vengeance LPX 3600MHz
SK Hynix Gold P31 1TB + Crucial MX500 1TB
EVGA CLC 360
XPG Core Reactor 750W
 

popatim

Titan
Moderator
So the top Gen4 slot is having issues negotiating back down to Gen3 you think?

Are you on the latest Bios?
 

Maikurosofuto

Commendable
Oct 24, 2019
102
16
1,615
7
So the top Gen4 slot is having issues negotiating back down to Gen3 you think?

Are you on the latest Bios?
The top slot only doesn't work properly at PCIe 4.0. I'm using the latest non-beta BIOS.
 

DRagor

Illustrious
Mentioned replacing mobo - to same model or it was different previously? It seems to be well known problem that some mobo/GPU combinations have problem when set to 4.0.
Btw, if it works when set to 3.0 why not leave it there? Performance difference should not be meaningful I think.
 
Reactions: KyaraM

Maikurosofuto

Commendable
Oct 24, 2019
102
16
1,615
7
Mentioned replacing mobo - to same model or it was different previously? It seems to be well known problem that some mobo/GPU combinations have problem when set to 4.0.
Btw, if it works when set to 3.0 why not leave it there? Performance difference should not be meaningful I think.
Same model.
About the PCIe 3.0 and 4.0 performance difference, for now it's virtually zero, but I'm always upgrading my hardware whenever I can, so that PCIe version may make a notable difference in the near future.
 

DRagor

Illustrious
Same model.
About the PCIe 3.0 and 4.0 performance difference, for now it's virtually zero, but I'm always upgrading my hardware whenever I can, so that PCIe version may make a notable difference in the near future.
So different motherboard model might not have such problems. This model might not have such problems in the future thanks to BIOS updates. Finally when you upgrade your GPU the new one might not have such problem just because it is different model. If you have to solve it now I would suggest changing motherboard to different model.
 

Maikurosofuto

Commendable
Oct 24, 2019
102
16
1,615
7
So different motherboard model might not have such problems. This model might not have such problems in the future thanks to BIOS updates. Finally when you upgrade your GPU the new one might not have such problem just because it is different model. If you have to solve it now I would suggest changing motherboard to different model.
I'm starting to suspect it's a CPU defect, I'm contacting AMD's support to see if they can confirm that, I might try a RMA, and depending on how long the support takes to to confirm or deny it, I'll do it next week since my warranty expires next month.
Here's another video of how it behaves with PCIe 4.0.
View: https://www.youtube.com/watch?v=jHg4dr9hr4M
 
Jun 28, 2022
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No. I'm well aware of the riser and PCI 4.0 issue, but never used it anyway.
Hi, Did you manage to solve this problem? I have it too and it came when I updated my ryzen 3700x -> 5600. Using TUF Gaming Wifi motherboard.

I also get sometimes "VGA card not supported by UEFI Driver" error if I try to boot as 4.0. Using 3.0 works for me..
 

Maikurosofuto

Commendable
Oct 24, 2019
102
16
1,615
7
Hi, Did you manage to solve this problem? I have it too and it came when I updated my ryzen 3700x -> 5600. Using TUF Gaming Wifi motherboard.

I also get sometimes "VGA card not supported by UEFI Driver" error if I try to boot as 4.0. Using 3.0 works for me..
Nope, rma'd the MOBO, rma'd the CPU, same issue.
And according to him (Head of GALAX in Latin America and a pro overclocker, among other things): Ronaldo Buassali
It's an AMD platform issue with some mobos. It doesn't occur on Intel boards.
 
Last edited:
Jun 28, 2022
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Nope, rma'd the MOBO, rma'd the CPU, same issue.
And according to him (Head of GALAX in Latin America and a pro overclocker, among other things): Ronaldo Buassali
It's an AMD platform issue with some mobos. It doesn't occur on Intel boards.

Thanks a lot! And too I'll hope that some bios would fix that. Good to know atleast the correct problem.

Did you set everything to GEN 3?

I have currently as GEN 3 these (maybe could set something auto):
PCIEX16_1 Mode
PCIEX16_2 Mode
PCIEX1_1 Mode
PCIEX1_2Mode

I did have M.2_1 & M.2_2 Link Mode and SB Link Mode as GEN 3 also but I set them as Auto because I guess that would affect the memory speeds. I'm not what exact stuff should I have as GEN3..
 

Maikurosofuto

Commendable
Oct 24, 2019
102
16
1,615
7
Thanks a lot! And too I'll hope that some bios would fix that. Good to know atleast the correct problem.

Did you set everything to GEN 3?

I have currently as GEN 3 these (maybe could set something auto):
PCIEX16_1 Mode
PCIEX16_2 Mode
PCIEX1_1 Mode
PCIEX1_2Mode

I did have M.2_1 & M.2_2 Link Mode and SB Link Mode as GEN 3 also but I set them as Auto because I guess that would affect the memory speeds. I'm not what exact stuff should I have as GEN3..
Since my NVMe is PCIe 3.0 I just left it at auto, the only thing I specified as "PCIe 3.0" is the top PCIe slot, PCIEX16_1, because my GPU is "PCIe 4.0" and auto will set it accordingly.
 
Reactions: zaikai
Jun 29, 2022
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Hey, I signed up just to respond to this.
Almost exactly the same problem for a year here. Crash on Windows dots under PCIe x16 gen4. Gigabyte Aorus Pro x570, AMD 5900X and 3080. Many BIOS updates ago I could boot to Windows but I would get "force to reinstall graphics driver" or something along those lines.

Gigabyte originally said waiting for a BIOS fix but I'm almost certain that this will not be the fix that will never come. I have swapped out every single component in my PC except the CPU at this point.

I was about to just send just my CPU off on its own (sent mobo back last week but they couldn't find a problem) but now you've said you sent mobo and CPU off andnothing changed, I'm going to send the entire PC back to the system builder, as they requested.

I don't normally buy full builds but because of the hardware shortages it was my only way to get an upgrade - so I'm lucky to have the luxury of getting someone to do the hard work for me.

Anyway, thanks, you encouraged me to send the entire unit and not just the CPU because it's more than likely a combination of things. Once I get a response in 7-10 days I'll let you know what their conclusion is.

Good luck! Keep us updated please
 
Reactions: zaikai
Jun 29, 2022
2
1
15
0
Nope, rma'd the MOBO, rma'd the CPU, same issue.
And according to him (Head of GALAX in Latin America and a pro overclocker, among other things): Ronaldo Buassali
It's an AMD platform issue with some mobos. It doesn't occur on Intel boards.
So an update from me with the same issue, it was my AMD 5900X that was the cause. The rest of the hardware has remained the same.

I know you already RMA'd your CPU OP but I'd be tempted to borrow another one to make sure.

Novatech in the UK (the system builder I bought from) also updated GPU firmware which didn't help. I have to give them a shoutout because their customer service has been amazing.

Good luck OP!
 

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