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This has come up a few times, you can check the SFF Case List sheet and go to the "odd sizes" tab. We've got a list of motherboards there that are DTX or mATX but not the full size. There's a custom filter view you can pick for the NCase M1 front-mounted PSU. Those restrictions should match the size of board possible in the NR200 with the PSU mounted to the front of the case.