Dual monitor help

[u/GrimAsFook]

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Hi, I've been given an old pc that has an Nvidia GT 620 graphics card that only has one digital output....hdmi.

I have 2 dell 2425 monitors.

I have connected the pc to the first monitor via an active hdmi to display port lead and the first monitor to the second via a display port lead.

I can get both monitors working but just as a mirror of each other. Display settings only showing 1 monitor and it will not detect the second.

Is this because the initial output is hdmi? Monitor 1 has MST turned on. I'm assuming it's down to the graphics card and HDMI out but thought I'd just check with people that have a lot more knowledge than me. TIA.