smallest motherboard with dual 2560x1440 video output

elguapo2014

Reputable
Jul 8, 2014
2
0
4,510

Rammy

Honorable
It can be done, but the selection is super limited as it's only thin mini ITX boards which will fit in a case like that.

At a guess, I'd assume you'd be looking at something like these-
Asus Q87T/CSM
Gigabyte GA-Q87TN
Gigabyte GA-H87TN
(There are other boards available depending on where you are buying from).

All should support up to three displays, and have a Display port and HDMI slot which should do the trick.