Help me spoil my boyfriend!

So my boyfriend’s birthday is coming up, and I’ve been saving up to really spoil him. I don’t know what they’re called but he wants a fancy gaming computer, monitors, graphic cards.. I don’t know what any of this means but I’m happy to get it for him. But what exactly am I purchasing? I want to get him the entire set up! And I know it’s going to cost a pretty penny so please list reputable items, thank you! Plus he also really likes Elden ring, so if there’s any computers that are Elden ring themed please let me know (I have no idea what I’m talking about)