It is not the chipset, but the processor that supports up to 3 monitors:
It all depends on how your motherboard and BIOS implements the video capability.
This message was posted on behalf of Intel Corporation
I understand you would like you know if you can or not setup dual display on your MSI* B150M MORTAR motherboard.
Let me apologize for any inconvenience this issue may be causing to you.
As mentioned our graphics controller supports up to three displays. Depending on how the motherboard manufacturer built the motherboard then the amount of monitors that can be used at the same time. Dual display is a common feature so it will be most likely supported with any combination of video ports that come in your motherboard.
The best option would be contacting MSI* directly so they can confirm dual display will work in that specific motherboard model. This link will give you their contact information https://ru.msi.com/about/contact-us
Let me know if you have or not any other inquiry.