Update the graphic card for my iMac? Suggestions?

Hi!

I have a 27” iMac core i7 2.93 GHz (mid-2010) with the Radeon HD 5750 1024 MB with 8GB memory.

I’m wanting to update the graphic card and I’m curious as to which one I should do choose. Or if there are any to choose from.

Yes, this is for a game update but mainly because Origin discontinued support for my graphic card.