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> this 250W unit is 170x50x25

They’ve been selling a 400W (still fanless!) DC-DC version for years and it’s only 160x51.5x26mm : https://hdplex.com/hdplex-400w-hi-fi-dc-atx-power-supply-16v...

I use it to power my CPU+mobo but I also have a couple of server PSUs further away to power my 3090 over several pairs of THNN. It’s far from a SFF build, but it can be totally silent.

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The difference is that this unit does the AC-DC conversion inside itself, whereas your DC-DC power supply relies on an external AC-DC brick that is likely the same size as this entire self contained unit, if not larger.

If you're dealing with solar or a vehicle you may already have DC available; too bad it can't take -48v which some racks still supply.

To be a fair comparison would need to include the AC-DC power supply that you keep outside to power that thing... it's double the size once you account for that.

More like 3x. My Emerson 7001484-J000 PSUs go full depth into a server chassis. But that’s a sunk cost since it’s much easier to build a 12VDC UPS instead of a 120/240VAC UPS

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