Intel Coffee Lake Core i5-8600K vs 7600K at 5GHz Review

If you were waiting for huge IPC gains out of the new Coffee Lake CPU from Intel, you might be waiting for a very long time. We take the Intel Coffee Lake Core i5-8600K CPU and match it up GHz to GHz with the Intel Core i5-7600K Kaby Lake processor. And we throw in a Ryzen 7 at 4GHz just for fun.


First off my apologies for this review, as it is going to be short and sweet, but will hopefully still have all the data you need in order to see what Intel's new Coffee Lake is all about.

Coffee Lake is Intel's "8th Generation" processor family. The i3, i5, and i7 will be its desktop CPUs. While we usually review the top-end i7 version, today we are going sans HyperThreading with the Core i5-8600K model. This is a 14nm lithography CPU. The 8600K has 6 cores and runs a total of 6 threads. The 8700K with HyperThreading will of course run 12 threads and have 12MB of cache compared to the 8600K's lesser 9MB.

TDP on our 8600K comes in at 95 watts, so it should be fairly easy to keep cool. You can see our 8600K overclocked to 5GHz in the below screenshot.

Article Image

With our robust XSPC water cooling loop, (that consists of a waterblock, a 4-fan copper radiator, and a D5 pump and reservoir) is keeping it cool and below 65C easily. Our vCore is very low and I did have this 8600K running briefly at 5.2GHz with a 3600MHz memory bus for a while as I was trying to dial in stability, but we will be getting back to that on another day. I am not expecting Coffee Lake to be a magic bullet in terms of overclocking however, but it looks to have a tiny more headroom that Kaby Lake.

Article Image

The motherboard we are using for our testing is a Gigabyte Z370 Aorus Ultra Gaming. This motherboard have been performing perfectly with the 8600K and of course we will have a review up soon.

Article Image Article Image

The RAM we are using is Corsair Vengeance LPX CMK16GX4M2B4000C19R rated at 4000MHz, but I have yet to get it to run at the rated 4000MHz, however running at 3600MHz has not been an issue. Both of our Intel systems today here used Corsair RAM at 3600MHz with identical timings.

Article Image