What's the maximum RAM I can run on a B450M PRO-VDH MAX AM4 AMD B450?

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The spec sheet for B450M PRO-VDH MAX lists 128GB of RAM, but vendors like Newegg, BH Photo, Amazon all list it at 64GB. Can anyone confirm the board will support 128GB?

I'm using this board in a Proxmox install with ZFS, 4TB RAID 10. I'd like to bump the RAM if it'll actually support 128. Elastic Search can be RAM intensive.
 

citay

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It also depends a lot on your CPU because of the IMC that's in there (integrated memory controller). Best results with a 3000-series model or newer.

In general, 4x 32 GB can work if you don't overdo it on the XMP profile. The maximum should be DDR4-3200, maybe that even needs some manual intervention. I would not risk DDR4-3600 there.

You will have to buy a new kit of 4x matched 32 GB modules if you can't get the exact same 2x 32 GB RAM that you have now anymore. They sometimes change the RAM ICs (chips) underneath the heatspreader without giving it a new model name. If the four modules are not matching, the IMC has to do the splits. There can only be one set of RAM parameters for the whole memory system, but then it would have to be some compromise that tries to make two different RAM kits happy at the same time, even though they need different parameters. So four matched modules is best.

I have to say, you're using a surprisingly low-end board for the workloads you seem to have (the "Pro" is MSI for "budget / low-end"). I know you weren't spoiled for choice with good B450M boards, but i would've gone for a B450M Mortar Max at least, or even go all out on a full-sized X470 Gaming M7 AC at the time.

Can you list all your hardware in detail, including CPU and PSU models?
 
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Yep, I'll drop the hardware below with the caveat this was my first build and I was admittedly lower information than I could have been. I'm not beholden to any of this equipment and would be inclined to upgrade the board. This is a homelab that'll have 15-20 VMs running various web servers, vuln servers, SIEM, firewall, network monitors.

* MSI PRO B450M PRO-VDH MAX AM4 AMD B450 SATA 6Gb/s Micro ATX AMD Motherboard
* AMD Ryzen 5 5600 3.5 GHz 6-Core Processor
* CORSAIR VS Series VS550, 550W, Active PFC, 80 PLUS White Certified Power Supply
* Seagate BarraCuda ST2000DM008 2TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drive Bare Drive - OEM (4 in RAID 10 configuration)
* G.SKILL 4 x 16GB Ripjaws V Series DDR4 PC4-25600 3200MHz for Intel Z170 Platform Desktop Memory Model F4-3200C16D-32GVK
* Gigabyte GV-N1030OC-2GI Nvidia GeForce GT 1030 OC 2G Graphics Card
* Samsung 970 EVO SSD 500GB - M.2 NVMe Interface Internal Solid State Drive with V-NAND Technology (MZ-V7E500BW), Black/Red

I found this B450M Mortar Max on PC Parts Picker. The MSI spec sheet says 128GB, but PCP says 64GB.
 
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citay

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My comment about the B450M boards was about the boards available at the time. Nowadays, i would get a B550 board or even an X570 board.
The best choice would be the MSI MAG B550M Mortar (WIFI / Max WIFI). It's pretty much the only µATX board-sized AMD board from MSI that uses nice components, like powerstages for its VRM.

We got a red flag about your PSU though. The Corsair VS550, if it's the old orange label one, is even among the worst PSUs ever. The grey- or black-label ones are only marginally better, they are classed as "Tier D • Only for iGPU builds" on the PSU tier list. They uses a simple so-called Double Forward topology, the secondary side uses passive rectification, all based on a cheap and outdated group-regulated design. It's not crucial to understand all of this, just know that it's it's too low-quality for the job at hand. This PSU is the result when a reputable PSU manufacturer tries to make a very cheap low-budget model.

I would replace this PSU with a higher-quality one at the earliest opportunity. I wrote a Guide: How to find a good PSU.
Whenever you are getting that new motherboard, make sure to have a new PSU ready as well.

About your RAM, i was under the impression that you had 2x 32 GB, turns out you have 4x 16 GB. So you will have to get a kit of 4x 32 GB no matter what, sorry for the misunderstanding.
As i said, stay at DDR4-3200. Ripjaws V are pretty good, have a look at the kit F4-3200C16Q-128GVK.

The memory QVL even for your board has some 4x 32 GB kits listed as verified. So trust the manufacturer. There's a bunch of wrong product information on sites like Amazon and probably also PCPP.
 
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Wow, that's not good about the PSU at all. The lab has been on the shelf for a minute, but I've finally got things squared away and am starting it back up. I'm ordering a better board and PSU today. I found the RAM kit you sourced and will pick those up too. Thank you for the wave off on the PSU and linked guides. Bookmarking those for future builds.

  • MSI MAG B550M MORTAR Micro ATX AM4 Motherboard
  • SeaSonic FOCUS Plus Platinum 550 W 80+ Platinum Certified Fully Modular ATX Power Supply
 
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Given this opportunity, I'm also going to pick up a second M.2 SSD that matches the first and create a RAID 1 boot disk. I was really stretching my budget when I built the thing. Learning a lot from this thread and YouTube, so the second go round will be more resilient and performant.
 

citay

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Good PSU choice, this will be a nice system.

RAID1 isn't necessary with a PCIe NVMe SSD. When you use a good SSD model (and you do), a hardware failure becomes extremely unlikely. Failure rates of a proper SSD are a fraction of a percent, making it the most reliable PC component that was ever sold, which was statistically proven. And for that minuscule eventuality, you just do regular backups. If you were to put two SSDs in RAID1, you would be creating a solution for the most reliable hardware in the PC (which therefore doesn't need a solution), but you are not protecting in any way about the real dangers such as user error, software mishaps, updates breaking something, and so on. For all these things, you need backups and not a mirroring RAID. Add to that the fact that RAID just has a tendency to create all sorts of problems along the way with the BIOS setup and so on, i read it regularly on this forum.
 
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