Graphics card compatibility?

I'm thinking of getting a used Lenovo Thinkcentre E73 pc off eBay and then upgrading it with it a AMD Radeon R9 270X graphics card, but I'm not sure whether it'll be compatible. Is there a way I can be sure they'll be compatible before I receive the pc?

Added (1). Here's a link to a website with what I think are the specs for the Lenovo but I need clarification
https://support.lenovo.com/...s/pd029623

Not going to happen. The R9 270X specifies a minimum 500W power supply unit (PSU). Your Lenovo has either a 180W PSU or a 280W PSU (depending on case size).
Your system can't power a video card such as the 270X