Intel Core i7 8700K / i5 8600K / i5 8400 'Coffee Lake' review: affordable six cores!

More cores for the same price!

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Overclocking: i5 8600K & i7 8700K

On their marketing slides Intel promises better overclocking for Coffee Lake, so we are very curious about the truth of their claims. We overclocked the Intel Core i7 8700K and the i5 8600K using an MSI Z370 Godlike Gaming motherboard, combined with G.Skill Trident Z-memory on 4000 MHz with CL14. 

We managed to achieve a stable overclock for the Core i7 8700K at 5.2 GHz with 1.425 volt. This resulted in a Cinebench 15-score of 1702 points, about 19 percent higher than the standard score. This bump in voltage did mean that the power consumption of the complete system increased to about 270 watt under load. The CPU heated up to an average of 92 degrees Celsius, with the hottest core at 95 degrees. This is with a custom loop, so with regular air- or water cooling you are probably hindered more by the amount of heat generation.

The Core i5 8600K turned out to be even better for overclocking. With the same voltage of 1.425 we achieved a stable clockspeed of 5.3 GHz. With the Core i5 the temperatures were also a lot lower, with an average maximum of 75 degrees Celsius and 77 degrees for the hottest core. The score in Cinebench 15 was 1314 points; this is 26% higher than stock! 

De Core i5 8600K bleek zelfs nog beter over te klokken. Bij eenzelfde spanning van 1,425 volt bleek een kloksnelheid van 5,3 GHz stabiel. Met de Core i5 bleven bovendien de temperaturen een stuk beter te verhapstukken, met maxima van gemiddeld 75 graden en 77 graden voor de warmste core. De score in Cinebench 15 bedroeg 1314 punten, maar liefst 26% hoger dan stock!


Compare

three products discussed in this review

  Product Lowest price

Intel Core i5 8400 Boxed

Socket 1151, 2.8 GHz, 6 cores, 65 W, 14 nm, Integrated graphics

Specifications Test results Reviews Prices

£175.98

Avg. £204.49
5 shops, no stock

Intel Core i5 8600K Boxed

Socket 1151, 3.6 GHz, 6 cores, 95 W, 14 nm, Integrated graphics, 0.055 Ah

Specifications Test results Reviews Prices

£269.99

Avg. £270.32
6 shops, 4x stock

Intel Core i7 8700K Boxed

Socket 1151, 3.7 GHz, 6 cores, 95 W, 14 nm, Integrated graphics, 0.055 Ah

Specifications Test results Reviews Prices

£395.99

Avg. £409.99
6 shops, 4x stock

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