https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 04 Apr 2026 12:46:32 +0000 Mon, 02 Mar 2026 21:27:22 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=113455 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200993&title=b450-pro4-pcie-conflict#200993 Author: Xaltar
Subject: 113455
Posted: 02 Mar 2026 at 9:27pm

That is great news. ASRock's Tech Support is usually pretty good with this kind
of request.

Enjoy ]]> Mon, 02 Mar 2026 21:27:22 +0000 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200993&title=b450-pro4-pcie-conflict#200993 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200992&title=b450-pro4-pcie-conflict#200992 Author: garagedrive
Subject: 113455
Posted: 02 Mar 2026 at 8:44pm

By updating to beta BIOS 10.45 which Asrock Tech sent me, now I can use both M2_2 & PCIe 4th slot. Just FYI ]]> Mon, 02 Mar 2026 20:44:34 +0000 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200992&title=b450-pro4-pcie-conflict#200992 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200980&title=b450-pro4-pcie-conflict#200980 Author: garagedrive
Subject: 113455
Posted: 27 Feb 2026 at 3:05pm

Now I see your point. M2_2 uses PCIe 3.0x2 from CPU, not PCIe 2.0x2 from B450 chipset. Lanes from CPU needs to be shared when utilizing M2_2. Thank you!]]> Fri, 27 Feb 2026 15:05:42 +0000 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200980&title=b450-pro4-pcie-conflict#200980 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200979&title=b450-pro4-pcie-conflict#200979 Author: Xaltar
Subject: 113455
Posted: 27 Feb 2026 at 2:41pm

That is something you would have to ask ASRock tech support directly:
https://tw.asrock.com/events/tsd.asp]]> Fri, 27 Feb 2026 14:41:44 +0000 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200979&title=b450-pro4-pcie-conflict#200979 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200978&title=b450-pro4-pcie-conflict#200978 Author: garagedrive
Subject: 113455
Posted: 27 Feb 2026 at 2:34pm

M2_2 uses only 2 lanes (3.0x2), so, SATA3_3 & 3_4 lanes sharing with M2_2 (3.0x2) make sense. 4th PCIe slot uses 4 lanes, so, PCIe 4th lanes sharing with M2_1 (3.0x4) make sense. I have the same problem (BIOS 10.43) when using PCIe 4-NVME conversion card.

Can anyone solve this issue? I think it can be fixed by updating BIOS. ]]> Fri, 27 Feb 2026 14:34:20 +0000 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200978&title=b450-pro4-pcie-conflict#200978 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200953&title=b450-pro4-pcie-conflict#200953 Author: gordenf
Subject: 113455
Posted: 21 Feb 2026 at 2:27pm

ahhh thanks! I checked the manual again, M2_2 uses 3.0x2，not 2.0x2 from chipset(as lanes of shared SATA was from chipset, so I only thought about chipset), and it all makes sense...M2_1, PCIE4, M2_2(NVME) share lanes.]]> Sat, 21 Feb 2026 14:27:10 +0000 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200953&title=b450-pro4-pcie-conflict#200953 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200928&title=b450-pro4-pcie-conflict#200928 Author: Xaltar
Subject: 113455
Posted: 16 Feb 2026 at 4:22pm

I would guess that the setting to force NVMe for M2_2 disables the PCIe4 slot.
NVMe uses 4 lanes where SATA3_3/4 only utilize a single lane between them. By
forcing NVMe on M2_2 the other lanes need to be taken from the PCIe slot.

You can open a support ticket and ask ASRock for a more definitive answer but based
on your description that is what's happening.]]> Mon, 16 Feb 2026 16:22:50 +0000 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200928&title=b450-pro4-pcie-conflict#200928 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200921&title=b450-pro4-pcie-conflict#200921 Author: gordenf
Subject: 113455
Posted: 14 Feb 2026 at 7:47pm

Hi, I have a problem with dual GPUs and nvme ssd in M2_2, it seems PCIE4 GPU conflicts with M2_2 nvme ssd.

I had a pin-misdefined ssd(cant be recognized in M2_1), so I can only mount it into M2_2 with bios setting 'Force nvme for M2_2 Slot'. With one GPU mounted in PCIE2(3.0 x16), everything ran smoothly. Then I bought another GPU and mounted it into PCIE4(3.0 x4), found that Windows can't recognize the PCIE4 GPU. That was strange, as M2_2 has nothing related to PCIE4(which shares lanes with M2_1), as M2_2 shares lanes with sata3_3 and sata3_4.

Then I tried turning off 'Force nvme for M2_2 Slot', not even removing ssd from M2_2, just rebooted(yes, this nvme ssd not showing in bios), booted another windows from ssd in sata3 slot, PCIE4 GPU showed in Taskmgr. Quite strange... so, any suggestion?

CPU: R7 5700X
MB: B450 Pro4, P10.43 beta(latest version)
RAM: 32GB DDR4 3200
SSD: Kioxia EXCERIA PLUS G3]]> Sat, 14 Feb 2026 19:47:09 +0000 https://forum.asrock.com/forum_posts.asp?TID=113455&PID=200921&title=b450-pro4-pcie-conflict#200921