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Just remember that using a none Acer case you will lose all the front USB ports that the proprietary Acer PO3-650 case is specially designed for the PO3-650 mobo and the front ports.

Front PO3-650 (655) ports that you will lose.

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Hi! I couldn't find the info back when I was doing it, so I compared the motherboards using photos =)
I made them semi-transparent and scaled them by the socket, then compared the mounting holes.
It's been about half a year, so I don't remember exactly, but I think ITX support is needed (though I'm not 100% sure).

Right now, you have at least two cases that have been tested and confirmed to work 🙂

I strongly do not recommend using a water cooling system.
There’s no dedicated pump header and the BIOS is really bad.
Fan control is pretty poor too. Air cooling is much more practical and safer on this motherboard.

Also, just a heads up — our lighting here is 12V, so any newer ARGB stuff won’t work properly without an additional controller.

I also used the front motherboard ports: a 50 cm USB Type-C extension cable, which makes it accessible without opening the case. For regular USB, I used a 2-meter hub placed under the monitor, where I plugged in the mouse and keyboard.