I've been running my 7800X3D on the ASUS ROG Strix B650E-I for about 8 months now. Rock solid board with excellent VRMs that handle the CPU with ease. The BIOS is intuitive and gets regular updates. The front USB-C header and three M.2 slots (one on back) are nice bonuses. Paid around $300 which felt fair for the feature set.

+1

Just catching this thread—honestly, the most CRITICAL thing to watch for when pairing any ITX board with a 7800X3D is the SOC voltage regulation and BIOS maturity. Early AM5 platform issues actually led to some X3D chips failing due to overvoltage, so you absolutely need a board with a rock-solid track record for AGESA updates. Don't just look at the raw power stages; on an ITX PCB, heat saturation is real. I’ve seen several "budget" ITX options cheap out on the VRM thermal pads or use subpar power chokes that start whining like crazy once you push a high-end GPU next to them. Also, keep an eye on the back-side M.2 cooling—it’s basically a furnace back there in small cases. I’d avoid anything with a 4-layer PCB if you want long-term memory stability at higher EXPO speeds; stick to 6 or 8 layers if you can. Just make sure the BIOS is flashed to the latest version before you even think about stability testing tho.

tbh the market for AM5 ITX is kinda weird right now because some brands are really leaning into the premium "overbuilt" side while others are just missing in action. like, MSI and Gigabyte have totally different approaches to their BIOS and PCB layouts compared to the ones already mentioned. before you settle on a brand though, what case are you actually using? i ask because some ITX boards have massive backplates or weirdly placed headers that can basically ruin your cable management in smaller enclosures. also, are you specifically looking for PCIe 5.0 for that 5070? idk if itll even need the bandwidth, but it changes which chipset tier you should be looking at. honestly, i’d recommend checking out the "AM5 Motherboard Spreadsheet" over on the r/sffpc subreddit. it’s a lifesaver for comparing VRM phases and rear I/O at a glance without having to dig through a dozen manuals. Hardware Unboxed on YouTube also has a few roundup videos that are great for seeing how these different brands handle thermal throttling in tight spaces. helps to see real data before dropping $300+ on a board.

@Reply #5 - good point! Honestly, building ITX on AM5 has been such a massive headache lately. I have been building SFF rigs for over a decade and the current state of the market just makes me want to pull my hair out. The price gouging is real. You pay this huge ITX tax and you still end up dealing with annoying tiny VRM fans that whine like crazy or coil whine that drives you nuts in a quiet room. It's honestly exhausting how much we have to compromise on layout just to get a board that wont cook itself. In my experience, the Gigabyte B650I AORUS Ultra DDR5 is a solid path if you want to avoid the daughterboard madness. I have used it in a few personal builds and that 12-layer PCB really helps with signal integrity and heat soak in small cases. I tried the MSI MPG B650I EDGE WIFI too, but the layout was a total mess for cable routing. The Gigabyte board handles the 7800X3D without breaking a sweat, tho you definitely gotta flash the BIOS first thing to fix the slow boot issues. It is just frustrating that we have to jump through so many hoops these days for a simple compact build...

ASRock B650E PG-ITX WiFi.