Well, he can easily check the CPU type using the Windows ‘System’ feature or connect his current monitor to the MB HDMI socket (and check the enable/disable setting in Bios).
Once he knows that the CPU does not have an internal GPU, he can choose a monitor for connection to the external GPU. I would however not make ‘both HDMI and DP interface’ a monitor requirement as that restricts the choice at the lower price end and makes the price higher. As my GPU has only one HDMI and three DP sockets, I connect my 4K TV (HDMI) to the HDMI socket and my 1080p HDMI monitor to the DP socket using a DP to HDMI adapter (about 10 euro). Works fine for me.
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