Overclocking Performance: CPU Tests

In the third page of the review we showed our overclocking results, with our CPU managing to hit 5.1 GHz stable with a sizeable increase in voltage. Running at 5.1 GHz incurred rather high temperatures however, so for our benchmark suite we dialed back to 5.0 GHz and run a number of our tests again at this fast speed. We also ran some benchmarks at stock frequency but with increased DRAM frequencies. We ran the DRAM in our ASRock provided system at DDR4-3466, slightly overclocked beyond its DDR4-3200 sticker value.

For this page (and the next), we’ll show the overclocked results of the Core i7-8086K using the fast memory kits as well as the 5.0 GHz overclocked setting (at base memory). The Core i7-8700K numbers are also included for reference.

FCAT Processing

System: FCAT Processing ROTR 1440p GTX980Ti Data

3DPM v2.1

System: 3D Particle Movement v2.1

Dolphin v5

System: Dolphin 5.0 Render Test

DigiCortex v1.20

System: DigiCortex 1.20 (32k Neuron, 1.8B Synapse)

Blender

Rendering: Blender 2.78

POV-Ray

Rendering: POV-Ray 3.7

Cinebench R15 ST

Rendering: CineBench 15 SingleThreaded

Cinebench R15 MT

Rendering: CineBench 15 MultiThreaded

7-zip

Encoding: 7-Zip Combined Score

TrueCrypt

Encoding: AES

GeekBench 4 ST

Office: Geekbench 4 - Single Threaded Score (Overall)

GeekBench 4 MT

Rendering: CineBench 15 MultiThreaded

For everything except the most lightly threaded workloads, overclocking the 8086K to a flat-out 5GHz shows some reasonable gains. These results aren't you couldn't already extrapolate based on the clockspeeds, but it's nice to put theory to practice. It also highlights the unfortunate shortcoming of the CPU: being able to turbo one thread to 5GHz just isn't that useful, since you'll very rarely have a complete system workload that allows it, even if the heaviest workload is single-threaded. The 8086K simply begs to be run at a flat-out 5GHz to get the most out of its capabilities.

GPU Tests: Grand Theft Auto V Overclocking Performance: GPU Tests
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  • bigboxes - Tuesday, June 12, 2018 - link

    I run to my 4790K to check for HSF. Who would have thought it had one in the box. No one buys that processor to use the stock HSF. Reply
  • mkaibear - Tuesday, June 12, 2018 - link

    I did. Worked fine. Reply
  • Marlin1975 - Monday, June 11, 2018 - link

    My 3570k came with a heatsink.

    Also in the AMD Ryzen reviews here it was pointed out there was no heatsink for the unlocked/higher chips. Yet in this review it was not and they did not use a regular/more common heatsink, but a very costly and less used water cooler.
    Reply
  • npz - Monday, June 11, 2018 - link

    Ok fair enogh, but the stock heatsink & fan Intel uses are crap so I don't think reviewers should be using them for actual benchmarks anyways as it will affect turbo speeds. Reply
  • Marlin1975 - Monday, June 11, 2018 - link

    That's the point. You use what they give to show its real performance. If it has a negative affect that is on the maker, not the user/reviewer.

    That way when you compare different CPUs they all have the same standard cooler so its apples to apples review.
    Reply
  • Inteli - Monday, June 11, 2018 - link

    Surely if you want to compare CPUs apples to apples, you'd want to use the same cooler for all of them (across brands, not just within), so the CPU is what's actually being tested. Why would only a stock cooler give "real performance" anyways? Are you saying the CLC on my 4690k is giving me "fake performance"?

    Not that it matters, because Intel didn't include a stock heat sink with this CPU.

    I would rather see CPUs hooked up to an absolutely overkill cooling setup (maybe a water chiller? :^) ) on stock clocks so the CPU can perform its absolute best.
    Reply
  • npz - Monday, June 11, 2018 - link

    It's real performance is with an aftermarket heatsink anyways which is why Intel stopped providing them for the K series after Haswell. As long as you use a cooler which will not impede the performance of the cpu, then the cpu benchmarks are all apples to apples comparison. It was so bad it would cause the cpus to throttle with certain heavy loads and you can forget about overclocking, which kills the point of the K-series.

    It will be an absolute disservice if Anandtech benchmarked with the stock heatsink. The only exception is Ryzen, especially Ryzen 2's wraith max heatsink which rivals high end aftermarket cooling
    Reply
  • cmdrdredd - Monday, June 11, 2018 - link

    ok but in the real world nobody is buying a K series CPU and running it stock. Reply
  • mkaibear - Tuesday, June 12, 2018 - link

    I do! (I intended to downclock it but it didn't downclock very well so I just left it at defaults. Stock cooler too - 2500K then 4790K) Reply
  • MDD1963 - Tuesday, June 26, 2018 - link

    Untrue, if the CPU is already at fairly high temps stock, going 10-15C higher in temps to gain 100 more MHz and 2 more FPS in a game seems ludicrous.... Reply

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