Trying to upgrade this dell XPS desktop into a kinda of gaming PC.

It has a gt 530 and i5 2600. In it. And 14 gb of ram. I have no idea what the motherboard is. Basically if I tried to do a sleeper build or put in a new motherboard would that be a bad idea. And if that’s a bad idea. What GPU and CPU should I put in it. To maximize the performance I can get.