Can I install a pcie x1 card in full size pcie slot?

It should work just fine The port should automatically drop down to x4 You may need to get a smaller plate though

In general, yes it should run on a X1 slot, if it can fit as some x1 slots are open ended to allow bigger cards to fit But check around to get

candy crush slot game and all are low end cards, If you have a x16 slot available, which you say you do, you can get better performing cards for what those cost

candy dreams_ sweet planet slot x1 slot and what PCIe lanes are is a very important consideration so that you can install