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How come there are very few nice micro atx AMD x570 mobos, let alone any at all?
Two reasons although one is more of an observation I guess.

First is that mATX in X570 makes very little to no sense because the only advantage over B550 is more gen 4 slots and that is one thing in short supply on that small form factor. Same with M.2 (for NVME's) as they'd have to share board space with the chipset heatsinking and fan.

Second is that board mfr's hate mATX with AMD for some reason. Been that way ever since AM3+ socket. They just don't make boards and those they do tend to be very low-end. That is until B550 boards; there's some really nice ones with powerful VRM's. Too bad Zen 2 doesn't really need them, maybe Zen 3 will...
How come there are very few nice micro atx AMD x570 mobos, let alone any at all?
Two reasons although one is more of an observation I guess.

First is that mATX in X570 makes very little to no sense because the only advantage over B550 is more gen 4 slots and that is one thing in short supply on that small form factor. Same with M.2 (for NVME's) as they'd have to share board space with the chipset heatsinking and fan.

Second is that board mfr's hate mATX with AMD for some reason. Been that way ever since AM3+ socket. They just don't make boards and those they do tend to be very low-end. That is until B550 boards; there's some really nice ones with powerful VRM's. Too bad Zen 2 doesn't really need them, maybe Zen 3 will have better overclocking potential.
 
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