So I bought two 27" 4k monitors and I've been using them with Brix i5-4200 (Intel HD Graphics 4400) via miniDP and HDMI @30Hz each. LOVE the monitors - can't go back to HD now. The Brix handles dual 4k but they're a little laggy. Mainly used for web design.
I'm thinking about replacing my Brix with MSI CUBI 2-016AU Intel i5-7200U which has Intel HD Graphics 620. Does anyone know if this will drive dual 4k monitors smoothly? Has anyone tried it before?
You may want to double check the refresh rate as well.
30hz causes laggy mouse movement and the like, where possible you want to run it at 60hz, however the integrated graphics is what limits this.
Check the specs of the integrated graphics to see what resolutions and refresh rates it supports (and over what type, e.g. HDMI or DisplayPort)