In looking at the SUPPORT PAGE, it says : One PCI Express x16 slot (Gen 3.0). But it also says 180w power supply. That usually means that an add on card is not easy. Also, it is a slimline case which will make things more difficult, too.
It becomes a chore to upgrade the graphics card sometimes. You might want to rethink this
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I checked the specs of the pc from the below link and it suggests that the motherboard has One PCI Express x16 slot (Gen 3.0) available which can be used to put in the graphics card however you will have to open the tower to hook that up.
I would most definitely heed that advice that @TheOldMan provided -- as I recently purchased a refurbished slimline HP PC for one of my family, intending to reuse a video card that was working an another, failed, PC -- and when I opened the case, I found out that the card (being the "normal" size) would not fit.
There are a few low-profile cards that MIGHT fit, but you would have to check the dimensions of the card against the available space to be sure they will fit before buying one.
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