UniFi UDM-SE vs Pro Max: PoE or Headroom

It is the one pairing among the eight gateways this site tracks where the more expensive unit does less on a row that matters daily. A buyer who assumes the dearer box is a superset will be wrong about the one feature they may have been buying it for.

Both are 1U units in the same 442.4 × 43.7 × 285.6 mm case with a 1.3-inch touchscreen, both take 3.5-inch Protect drives, and both carry two 10G SFP+ ports and a 2.5 GbE copper WAN. How to choose a UniFi gateway sets them beside the desktop units.

That budget carries roughly eight G6 Bullet cameras at 9.9 W apiece, or a smaller mix including access points — a U7 Pro takes up to 21 W on PoE+. PoE budget planning works the numbers for a specific set.

The practical consequence is a rack unit's worth of difference. Behind the Pro Max, a PoE switch is not optional once there is a single camera, which adds cost and another unit to the rack that the SE's price already includes.

Those ratings are the reason to accept losing PoE, and they only matter at a size where a separate PoE switch was inevitable anyway. A site with 150 UniFi devices is a site with switches in the rack already.

The second 3.5-inch drive bay belongs to the same argument, because doubling camera capacity is of little use if the footage has nowhere to land. The Pro Max also runs its A57 cores at 2.0 GHz against 1.7 GHz.

Below those ceilings the extra $100 buys nothing a smaller site can feel, while the PoE it gives up is felt on the first camera.

Size a UPS from the loaded figures rather than the labels. A fully committed SE can pass 180 W to devices on top of its own 50 W, which makes it the heavier draw of the two in practice even though its headline number is lower.

Weight follows the internals: 5 kg for the SE against 4.7 kg for the Pro Max, the PoE circuitry accounting for the difference. Both operate from -10 to 40 °C.

A gateway with PoE is a convenience rather than a capability, since a switch does the same job with more ports and a larger budget. The SE earns its price in small racks where 180 W covers everything and the saved unit matters.

The reverse case is worth stating too. If the site needs both very high capacity and a lot of PoE, the answer is the Pro Max plus a switch, and the SE was never in the running. UDM-Pro vs Dream Machine Pro Max covers that step without the PoE question attached.

The dearer unit is not the superset here, so decide on powered devices first and ceilings second.

Buy the Dream Machine SE if:

• Cameras or access points need power from the rack. 180 W is the only PoE in the rack line.
• Your site fits 100+ devices and 24 HD cameras. Those ratings cover most small businesses.
• You want one unit doing two jobs. Gateway and PoE switch in 1U.

Buy the Dream Machine Pro Max if:

• The device or camera count is past the SE's ratings. 200+ devices, 50 HD cameras, two drive bays.
• A PoE switch is already racked. The SE's advantage disappears, and the headroom is what is left.
• The line is faster than 3.5 Gbps with inspection on. That is the SE's ceiling and the Pro Max's is 5 Gbps.