Dell OptiPlex 7460 All In One Teardown 

Your CPU and graphics are working hard to keep up with the games requirements, my thoughts are if it's not lagging or crashing it should be fine, increasing you memory may help, I'm thinking that it will take away some of the taxing from the swap files. My computers fan sounds like a jet getting ready for takeoff when compiling videos

Change ur thermal paste. I did the same and it helped

If you like games, time to get a newer more robust build.