If you have a full length PCI Express slot, then any modern day video card will work. Even if your motherboard were to have PCIe 2.0, todays video cards would still work, but be anywhere from 2% to 5% slower than if the PCIe slot is 3.0.
I attempted to download the manual for that system, but I could not get it to copmplete the download, depite trying about 15 times.
But on Newegg, checking the specs there, there was no mention of any slots on that motherboard at all. It simply lists a GT 620 GPU, and the letters "PCI" are nowhere on that page. If it had them, they would most certainly be there. It is very uncommon to find a system without anty PCI Express slots, but companies can order custom board without features to save a few cents here and there.And it appears that this might have happened in this case.