Does it need to? If it can maintain a target FPS, which it is entirely capable of unless you're shooting for 120/144 Hz, that's all that most gamers need. The extra threads only help its case.The 4790 will not beat a modern i5 (non K) in games, it has about 10 percent slower.
Til it's overclocked or the extra threads are thrown into the mix. Granted, a 7600k will overclock more for a higher IPC, BUT lots of games are now taking advantage of >4 threads, which means that the 4790k would still be ahead for smoothness/playability.The 4790k will just about draws with a i5 7600. The 4790 will not.