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The Core i9-9900K is about 10 to 15 percent slower on laptops

The Core i9-9900K is about 10 to 15 percent slower on laptops (Image source: Intel)
The Core i9-9900K is about 10 to 15 percent slower on laptops (Image source: Intel)
Hotter temperatures and slower clock rates are expected, but how much of a performance dip can we really expect? Early benchmark tests show the i9-9900K trailing by about 10 percent or more when on a laptop compared to a full-size desktop PC.

With a base clock rate of 3.6 GHz and a maximum Turbo Boost of 5.0 GHz, the octa-core Core i9-9900K is easily one of the fastest consumer CPUs Intel has ever released. The 95 W TDP processor is made for enthusiast desktop PCs that normally have the cooling necessary to house and run the CPU at its peak.

So, what happens when you install such a CPU on a laptop? Certain Clevo barebones, like the P775 series, are designed with LGA1151 sockets to accept desktop CPUs of up to certain TDP levels. Resellers like Schenker and Eurocom are already configuring their respective workstations or laptops with Core i9-9900K options. Our own tests on the Schenker XMG Ultra 17 laptop based on the Clevo P775 chassis show that the i9-9900K can easily outperform the Core i7-8850H and i9-8950HK by about 45 percent each in multi-threaded workloads to be one of the fastest consumer laptops money can buy.

The full story, however, shows our i9-9900K laptop trailing behind desktop PCs equipped with the same CPU. According to Trusted Reviews, a "proper" desktop PC with the i9-9900K returns a CineBench R15 Multi-Thread score of 2058 points compared to just 1865 points on our Schenker for a performance increase of about 10 percent. If assuming that the desktop PC can also hold faster Turbo Boost clock rates for longer, then this delta can grow to about 15 percent.

Gamers are unlikely to see huge gains in gaming performance if jumping from an existing Coffee Lake-H CPU like the i7-8750H or i9-8950HK. Nonetheless, the raw boost in CPU performance is still significant even if slightly slower than a full-fledged desktop implementation.

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Cinebench R15
CPU Single 64Bit
Schenker XMG Ultra 17 Coffee Lake Refresh
Intel Core i9-9900K
209 Points ∼100%
Asus Chimera G703GI
Intel Core i9-8950HK
206 Points ∼99%
Eurocom Sky X4C
Intel Core i7-8700K
192 Points ∼92%
Schenker XMG Ultra 17
Intel Core i7-8700
190 Points ∼91%
Aorus X7 DT v8
Intel Core i7-8850H
182 Points ∼87%
AMD Ryzen 1800X - Asus Crosshair VI Hero
AMD Ryzen 7 1800X
157 (min: 155, max: 159) Points ∼75%
CPU Multi 64Bit
Schenker XMG Ultra 17 Coffee Lake Refresh
Intel Core i9-9900K
1865 Points ∼100%
AMD Ryzen 1800X - Asus Crosshair VI Hero
AMD Ryzen 7 1800X
1617 (min: 1603, max: 1630) Points ∼87%
Eurocom Sky X4C
Intel Core i7-8700K
1359 Points ∼73%
Asus Chimera G703GI
Intel Core i9-8950HK
1312 Points ∼70%
Aorus X7 DT v8
Intel Core i7-8850H
1276 Points ∼68%
Schenker XMG Ultra 17
Intel Core i7-8700
1167 Points ∼63%
Cinebench R11.5
CPU Single 64Bit
Schenker XMG Ultra 17 Coffee Lake Refresh
Intel Core i9-9900K
2.38 Points ∼100%
Asus Chimera G703GI
Intel Core i9-8950HK
2.34 Points ∼98%
Schenker XMG Ultra 17
Intel Core i7-8700
2.18 Points ∼92%
Eurocom Sky X4C
Intel Core i7-8700K
2.16 Points ∼91%
Aorus X7 DT v8
Intel Core i7-8850H
2.07 Points ∼87%
AMD Ryzen 1800X - Asus Crosshair VI Hero
AMD Ryzen 7 1800X
1.79 Points ∼75%
CPU Multi 64Bit
Schenker XMG Ultra 17 Coffee Lake Refresh
Intel Core i9-9900K
21.2 Points ∼100%
AMD Ryzen 1800X - Asus Crosshair VI Hero
AMD Ryzen 7 1800X
18 (min: 17.98, max: 18.08) Points ∼85%
Asus Chimera G703GI
Intel Core i9-8950HK
15.14 Points ∼71%
Eurocom Sky X4C
Intel Core i7-8700K
14.98 Points ∼71%
Aorus X7 DT v8
Intel Core i7-8850H
14.02 Points ∼66%
Schenker XMG Ultra 17
Intel Core i7-8700
12.9 Points ∼61%

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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2018 11 > The Core i9-9900K is about 10 to 15 percent slower on laptops
Allen Ngo, 2018-11- 3 (Update: 2018-11- 3)
Allen Ngo
Allen Ngo - US Editor in Chief
After graduating with a B.S. in environmental hydrodynamics from the University of California, I studied reactor physics to become licensed by the U.S. NRC to operate nuclear reactors. There's a striking level of appreciation you gain for everyday consumer electronics after working with modern nuclear reactivity systems astonishingly powered by computers from the 80s. When I'm not managing day-to-day activities and US review articles on Notebookcheck, you can catch me following the eSports scene and the latest gaming news.