https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 25 May 2026 13:00:22 +0000 Mon, 02 Feb 2026 22:48:33 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=97783 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=97783&PID=200872&title=b850mx-vrmpound#200872 Author: Xaltar
Subject: 97783
Posted: 02 Feb 2026 at 10:48pm

All spam links will be removed and the user posting them banned. ]]> Mon, 02 Feb 2026 22:48:33 +0000 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=200872&title=b850mx-vrmpound#200872 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=200870&title=b850mx-vrmpound#200870 Author: thismischief
Subject: 97783
Posted: 02 Feb 2026 at 11:30am

ATF wrote: > 6+1+1 Phase Power Design, Dr.MOS for VCore What's the amperage of the stages and why is this info not included? https://www.asrock.com/MB/AMD/B850M-X/index.asp

The ASRock B850M?�X WiFi R2.0 / ASRock B850M?�X R2.0 lists a 6+1+1 Phase Power Design with Dr.MOS for VCore, but ASRock doesn?�t list the amperage per phase anywhere in the official specs. That?�s common with budget boards ??manufacturers often skip actual amps because VRM quality and cooling matter more than just phase count. Without that data it?�s hard to gauge true sustained power.

Edited by Xaltar - 02 Feb 2026 at 3:59pm]]> Mon, 02 Feb 2026 11:30:37 +0000 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=200870&title=b850mx-vrmpound#200870 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182701&title=b850mx-vrmpound#182701 Author: eccential
Subject: 97783
Posted: 19 Feb 2025 at 5:51am

PCIe lanes are almost generic.

CPU even has the ability to split them differently.
For example, the first 16 lanes can be split into x8/x8, or even x4/x4/x4/x4 (not all CPUs can do this).

So you can actually install multiple NVMe drives onto the big x16 slot using a special bifurcation adapter. I think AsRock even made one at some point.

I'm not sure if 4 lanes are absolutely reserved for the chipset, either.
Since a chipset isn't required (X600), it may even be possible to attach SEVEN NVMe x4 drives directly to the CPU, if a motherboard like that is made.
]]> Wed, 19 Feb 2025 05:51:12 +0000 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182701&title=b850mx-vrmpound#182701 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182698&title=b850mx-vrmpound#182698 Author: ATF
Subject: 97783
Posted: 19 Feb 2025 at 5:02am

Ah, I thought the 8 CPU lanes were only usable for NVMe.
Probably not a big deal indeed.

https://images.anandtech.com/doci/17585/SoC_26.png]]> Wed, 19 Feb 2025 05:02:27 +0000 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182698&title=b850mx-vrmpound#182698 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182415&title=b850mx-vrmpound#182415 Author: eccential
Subject: 97783
Posted: 18 Feb 2025 at 7:57am

It's just a choice they make. They route 4 CPU PCIe lanes to the second PCIe slot in their other motherboards, and so the second m.2 NVMe slot is wired to the chipset. Not a huge deal for most people. If you absolutely need the second NVMe to be directly connected to the CPU, you can always just buy a PCIe to m.2 NVMe card. They're not that expensive. I have a couple of StarTech ones.

I don't know why AsRock doesn't publish the VRM implementation details. It's not like most people here work for AsRock or anything like that. Do other companies publish their VRM implementation details? For the most part, we have to depend on tech websites that buy them and manually gather information, by removing the heatsinks and possibly even analyzing the circuit board designs.

PS: Maybe I misunderstood your question.
AM5 CPUs, like the 7000-series (Raphael) and 9000-series (Granite) have 28 PCIe lanes.
4 are used to connect to the chipset. So 24 left.
16 are used for the main PCIe slot, usually used for a GPU). So 8 left.
4 are used for the main m.2 NVMe slot. So 4 left.
What to do with this final 4 lanes? Route it to another m.2 NVMe slot, or to another PCIe (x4) slot.
Not a huge deal either way. It's just a choice they make, and something consumers should research when making purchasing decisions.

Of course, most consumers are clueless, so....



Edited by eccential - 18 Feb 2025 at 8:01am]]> Tue, 18 Feb 2025 07:57:07 +0000 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182415&title=b850mx-vrmpound#182415 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182414&title=b850mx-vrmpound#182414 Author: ATF
Subject: 97783
Posted: 18 Feb 2025 at 4:36am

Why aren't all second M.2 slots wired to the CPU?

Do you know why Asrock isn't publishing the VRM info?]]> Tue, 18 Feb 2025 04:36:18 +0000 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182414&title=b850mx-vrmpound#182414 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182105&title=b850mx-vrmpound#182105 Author: eccential
Subject: 97783
Posted: 17 Feb 2025 at 10:10pm

Based on the similarities between B650M-H/M.2+ (Plus is important here) and the new B850M-X, I'm going to guess that they share a similar (or even the same) VRM setup.

These are the only AsRock boards where the second m.2 NVMe slot is wired directly to the CPU.

According to TechSpot article, they're 50A stages, so 6 * 50 = 300A.
In theory, it should be more than enough to run even the 170W TDP (230W PPT) CPUs like the 9900X and 9950X.

Of course, they will be driven harder than VRMs on higher end boards with 8 or even 12 stages, but as long as you have adequate cooling, I imagine they'll be fine.
]]> Mon, 17 Feb 2025 22:10:15 +0000 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182105&title=b850mx-vrmpound#182105 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182001&title=b850mx-vrmpound#182001 Author: ATF
Subject: 97783
Posted: 17 Feb 2025 at 7:11pm

> 6+1+1 Phase Power Design, Dr.MOS for VCore

What's the amperage of the stages and why is this info not included?

https://www.asrock.com/MB/AMD/B850M-X/index.asp]]> Mon, 17 Feb 2025 19:11:15 +0000 https://forum.asrock.com/forum_posts.asp?TID=97783&PID=182001&title=b850mx-vrmpound#182001