http://www.pcgamer.com/intel-i5-8400-review-the-best-new-gaming-cpu-in-years/

I've been hearing complaints about Core i5 'only' having four CPU cores ever since Ryzen 5 came to market, and for good reason. If you're just playing games, the chips are good and have arguably been the best value Intel processors, but do something more complex than gaming (like livestreaming or CPU-based video encoding) and a 4-core/4-thread (4C4T) chip can really start to bog down. With AMD offering 6C12T Ryzen 5 parts for around $200, Core i5 has become increasingly difficult to recommend. Intel's solution to this problem is now here, thanks to its 8th Gen Core i5 processors (aka, Coffee Lake or CFL).

I covered more of the details of the Coffee Lake launch in the Core i7-8700K review, but this is the biggest generational improvement in Intel's mainstream CPU line since the mainstream/enthusiast split that occurred with the 1st Gen Core i7 in 2010. Core i7 and Core i5 both get 50 percent more cores/threads, without a drop in clockspeeds, and Core i3 basically takes the previous generation Core i5's place as a 4C4T part. If you're still running a 2nd or 3rd—or even 4th—Gen Core processor, it's finally time to upgrade. And just like AMD's Ryzen 5, Intel has a compelling Core i5 model available for under $200, the i5-8400.