It should be enough for gaming. The requirements for games in recent years didn't jumped that much as it used before, most players can play them fine on 3-4 year old rigs with decent details, unless they didn't got some office PC. In games the most important is your GPU anyways, CPU gets major role only if you try to play with a multiplayer crowd.
The only problem I see that is a older and not really successful architecture, though for a 8 core CPU it doesn't eats much - 125W, which will also mean it has some space for overclocking if you have a better cooler. I would say keep it, will run current games just fine, for a Trinity architecture you would probably also need a new motherboard with socket FM2, since the 8150 is for the older AM+3