Intel i5-8600K Review & Overclocking vs. 8400, 8700K, & More

By Published November 29, 2017 at 6:07 pm
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Additional Info

  • Component: CPU
  • Original MSRP: 300
  • Manufacturer: Intel

Total War: Warhammer – Intel i5-8600K vs. R5 1600(X), i7-8700K

Total War: Warhammer at 1080p and high settings hits a GPU cap at around 176FPS AVG, which our overclocked i5-8600K bumps into, alongside the overclocked and stock 8700K. The stock 8600K, meanwhile, treads at 164FPS AVG, about at parity with the stock 7700K, and about 5.8% ahead of the 8400 with 3200MHz memory, or 9.8% ahead of the 2666MHz memory version. The R5 1600X plots a 147FPS AVG when overclocked to 4GHz, marking the 8600K stock CPU as 12% ahead, and the overclocked variant at least 20% ahead, before hitting the GPU wall.

At 1440p, our top-end numbers are dragged down by further GPU limits, bringing scoring somewhat closer together – though the numbers don’t scale as perfectly as in some other titles, where we get identical framerates up until a GPU limit is hit. We’ll highlight the 8600K CPUs, the R5 1600X CPUs, and the 8700K CPUs.

8600k tww 1080p

8600k tww 1440p

Watch Dogs 2 CPU Benchmark – Intel i5-8600K vs. R5 1600X, i7-8700K

8600k wd2 1080p

Watch Dogs 2 at 1080p and High settings has us at 97FPS AVG for the stock i5-8600K, which puts it effectively tied with the 5GHz i7-7700K, a 4C/8T CPU. The stock 7700K runs at 94FPS, placing our stock 8600K just ahead of that. As for the other 8th Gen i5, the i5-8400, that one’s at 88FPS AVG. This marks the i5-8600K as a clean 10% ahead of the 8400, or 27% of the Kaby Lake i5-7600K stock CPU. As for the R7 family, that’s represented by our R7 1700 CPU (which is also, at time of writing, presently on sale), a few FPS behind the 8600K stock CPU, and the R5 1600X 4.1GHz CPU at 86FPS AVG. The stock 8700K remains 11% ahead of the stock 8600K, with the OC vs. OC battle landing the 8700K OC at 6.7% ahead.

8600k wd2 1440p

Moving to 1440p for Watch Dogs 2, the i5-8600K and i7-8700K are functionally tied at their 5GHz clocks, where we are either bumping against a GPU limitation or IPC limitation, and the 7700K at 5GHz isn’t far behind. The stock 8600K carries the same framerate as at 1080p, which is because it is still fully CPU-bound and doesn’t become GPU constrained until overclocked. Our scaling is mostly the same as previously, other than the changes at the top.

Destiny 2 CPU Benchmark – i5-8600K vs. i5-8400, 8700K, R7 1700

Destiny 2 doesn’t have all of the 8th Gen CPUs on it yet, and a few of the other CPUs are also still absent from this chart. Our initial Destiny 2 launch CPU benchmark is here.

8600k destiny2 1080phigh

At 1080p/High, the i5-8600K overclocked CPU demonstrates the limitations of usefulness of Destiny 2 as a benchmark. The game caps at 200FPS, and so we’re right up against that – we actually don’t know the full framerate potential for the game, as it’s running against the limits as-is. The stock 8600K is at 190FPS AVG, still occasionally tipping into the 200FPS territory, and is tied with the stock 7700K. The i3-8350K CPU isn’t far behind. In our initial launch review of Destiny 2’s CPU performance, we noted that the game doesn’t much care for threads, and is almost entirely frequency-dependent. This is why AMD lags behind, and also why AMD’s CPUs all normalize at the same frequency. Take a look at the 1600X versus the overclocked 1700, which are closer in framerate than a stock 1700 and stock 1600X. The game also doesn’t seem to utilize SMT, which further contributes to the performance disparity.

8600k destiny2 1440phigh

At 1440p/High, the stack remains similar, but we bump into GPU limits at the very top-end of the chart. The i5, i7, and i3 CPUs are all nearly equal in performance, with differences all within margin of test error and variance.

GTA V CPU Benchmark – i5-8600K vs. 8400, 8700K, 1700

8600k gtav 1080p

GTA V is staying on our bench from popular demand, but it has a few quirks with it: One, when CPUs hit the 187.5FPS cap, the frametimes can encounter big stutters – we solved this by increasing CPU load with advanced settings. Two, AMD CPUs don’t particularly play well with GTA V, and have more exaggerated performance deltas than other games. In this way, both Intel and AMD have things working against them in GTA, and so it comes down to a matter of game-level optimization.

At 1080p, the i5-8600K stock CPU places just between the overclocked 8350K at 4.8GHz and the stock 7700K, running a 134FPS AVG. This marks it as 8.3% ahead of the i5-8400 CPU, and about 25% ahead of the overclocked 4.1GHz R5 1600X. The 8700K, expectedly, manages an 8.6% lead over the 8600K. Overclocking the 8600K allows it to nearly achieve parity with a similarly overclocked i7-8700K, both at around 148-150FPS AVG.

8600k gtav 1440p

1440p has the stack largely the same, with the overclocked 8600K hitting the GPU limits, right alongside the overclocked 8700K at 5GHz. The stock 8600K is near them, roughly tied with the 4.8GHz Core i3-8350K. The stock 8600K is about 5.2% ahead of the stock 7600K.

Ashes of the Singularity Dx12 CPU Benchmark – i5-8600K

8600k aots 1080p

Ashes of the Singularity at 1080p/High has us at 37.7FPS AVG for the stock 8600K, about 6.8% ahead of the i5-8400, or about 18.6% ahead of the i5-7600K stock CPU. The stock 8600K also ends up just under the 1600X in Ashes, which is a heavily thread-dependent benchmark, with the 1600X about 2.4% ahead in performance. Overclocking the 8600K to 5GHz gets it up to about the same performance as the i7-7700K at 5GHz, and just behind the 8700K stock CPU. Again, because this is thread-dependent, the overclocked 8700K pulls away from the overclocked 8600K, with a difference of 6.2%, favoring the 8700K CPU. Threadripper is proof, if you needed more, that this particular benchmark actually utilizes its threads.

As for 1440p, all the results are the same, as this test is entirely CPU-bound with no GPU limitations in our benchmark, so no point in going through the numbers twice. Let’s move on.

Continue to the final page for Blender, Power, and the conclusion.


Last modified on November 29, 2017 at 6:07 pm
Steve Burke

Steve started GamersNexus back when it was just a cool name, and now it's grown into an expansive website with an overwhelming amount of features. He recalls his first difficult decision with GN's direction: "I didn't know whether or not I wanted 'Gamers' to have a possessive apostrophe -- I mean, grammatically it should, but I didn't like it in the name. It was ugly. I also had people who were typing apostrophes into the address bar - sigh. It made sense to just leave it as 'Gamers.'"

First world problems, Steve. First world problems.

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