https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 11 May 2026 21:21:28 +0000 Tue, 30 Sep 2025 16:41:54 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=108008 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=108008&PID=199090&title=b650d4u-vs-b650d4u3#199090 Author: reedilo02
Subject: 108008
Posted: 30 Sep 2025 at 4:41pm

I?™m comparing the B650D4U3 and B650D4U motherboards for my build. Can anyone share their real-world experience on slot differences, BIOS stability, and performance? What practical impact does the ????actually have?]]> Tue, 30 Sep 2025 16:41:54 +0000 https://forum.asrock.com/forum_posts.asp?TID=108008&PID=199090&title=b650d4u-vs-b650d4u3#199090 https://forum.asrock.com/forum_posts.asp?TID=108008&PID=193532&title=b650d4u-vs-b650d4u3#193532 Author: prak32
Subject: 108008
Posted: 15 May 2025 at 11:39pm

You're right. The motherboard variants are shifting the PCI lanes around. Some are direct to CPU, some are going through the chipset. It is my understanding the CPU is the fastest.

For me, I want to run dual M.2 (I mirror my SSD drive). I don't want them running at different speeds either, so I want both drives to have direct CPU access. The other PCI requirement is for my HBA card. The only feature I'm missing is faster LAN/Ethernet, but don't want to give up my need for fast drives.

B650D4U3 (+SATA, -MCIO) or EPYC4000D4U (-SATA, +MCIO) look to be the best choices for me.

Unfortunately neither are in stock. Not sure what's going on with availability (is nobody able to build AMD5 servers right now??) Frustrated.

]]> Thu, 15 May 2025 23:39:15 +0000 https://forum.asrock.com/forum_posts.asp?TID=108008&PID=193532&title=b650d4u-vs-b650d4u3#193532 https://forum.asrock.com/forum_posts.asp?TID=108008&PID=193524&title=b650d4u-vs-b650d4u3#193524 Author: eccential
Subject: 108008
Posted: 15 May 2025 at 7:57pm

Looks like 3 also lost the DisplayPort output.

Ryzen 7000/9000 EPYC 4004/4005 only have 28 PCIe lanes, and 4 of them are used to connect to the chipset (Fusion Controller Hub as it was designated in the AsRockRack page). So ultimately, you get to play around with 24 lanes.

16 + 4 + 4 is all you'll get, and the only difference will be how you arrange them.

You can of course also do 8 + 8 + 4 + 4 or some other arrangement, but you'll never get more than 24 from the CPU on AM5.

I do wonder if there are any boards WITHOUT a chipset (also known as X600), giving you access to all 28 lanes from CPU.
]]> Thu, 15 May 2025 19:57:19 +0000 https://forum.asrock.com/forum_posts.asp?TID=108008&PID=193524&title=b650d4u-vs-b650d4u3#193524 https://forum.asrock.com/forum_posts.asp?TID=108008&PID=192779&title=b650d4u-vs-b650d4u3#192779 Author: prak32
Subject: 108008
Posted: 14 May 2025 at 2:58am

What is the big difference between the two AMD motherboards: B650D4U3 vs B650D4U?

Is it basically the PCI slot and the M.2 slot swapping CPU vs. FCH?

Any other differences?

BIOS management software the same (BCM)?

What does the "3" mean?

Also curious why more PCI lanes aren't available to the CPU. Is this a chipset limitation? AM5 socket limitation? CPU limitation?

Thank you,

]]> Wed, 14 May 2025 02:58:37 +0000 https://forum.asrock.com/forum_posts.asp?TID=108008&PID=192779&title=b650d4u-vs-b650d4u3#192779