B450 or other mATX Recommendations - IOMMU groups

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I am planning a fresh build and trying decide on a motherboard. I have a Ryzen 5 3600x that I was going to use and I wanted a small form factor without spending a lot. Thus the B450 chipset. My main uses are NAS, Plex, and a lightweight VM mostly used to browse the web.


Does anyone have a B450 with good IOMMU groups? The x470 I used for my first Unraid build had the USB controller tied to the SATA controller and killed some of my ambitions. I've searched the forums and internet for success stories with this chipset when it comes to getting USB controllers (and the like) passed through but I've found mostly problems and not successes.


I'm also not married to the Ryzen. If anyone has a recommendation for a $200-300 CPU/Mobo combo, I'm all ears. I just need mATX, at least 4 SATA, and an M2.

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