IntelBX80684I78700K
IntelBX80684I58400

6 Cores, 12 Threads @3.7GHz, Coffee Lake.
Release date: Q4 2017.

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6 Cores, 6 Threads @2.8GHz, Coffee Lake.
Release date: Q4 2017.

Real World Speed
Performance profile from 516,537 user samples
377,946 User Benchmarks
Best Bench: 107% Base clock 3.7 GHz, turbo 5 GHz (avg)
Worst Bench: 78% Base clock 3.7 GHz, turbo 1.6 GHz (avg)
Poor: 78% Great: 107%
SPEED RANK: 18th / 1206
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 93%
Nuclear submarine
Workstation
Workstation 78%
Battleship
138,591 User Benchmarks
Best Bench: 84% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 72% Base clock 2.8 GHz, turbo 2.8 GHz (avg)
Poor: 72% Great: 84%
SPEED RANK: 64th / 1206
Gaming
Gaming 80%
Battleship
Desktop
Desktop 80%
Aircraft carrier
Workstation
Workstation 56%
Gunboat
Effective Speed
Effective CPU Speed
92.3 % Faster effective speed.
+16%
79.8 %
1-Core
Avg. Single Core Mixed Speed
136 Pts Faster single-core speed.
+17%
116 Pts
2-Core
Avg. Dual Core Mixed Speed
267 Pts Faster dual-core speed.
+16%
231 Pts
4-Core
Avg. Quad Core Mixed Speed
516 Pts Slightly faster quad-core speed.
+15%
450 Pts
8-Core
Avg. Octa Core Mixed Speed
835 Pts Much faster octa-core speed.
+31%
638 Pts
1-Core
OC Single Core Mixed Speed
155 Pts Faster OC single-core speed.
+27%
122 Pts
2-Core
OC Dual Core Mixed Speed
308 Pts Faster OC dual-core speed.
+27%
242 Pts
4-Core
OC Quad Core Mixed Speed
608 Pts Faster OC quad-core speed.
+27%
477 Pts
8-Core
OC Octa Core Mixed Speed
984 Pts Much faster OC octa-core speed.
+42%
694 Pts
Market Share
Based on 22,610,001 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.74 % Much higher market share.
+79%
0.97 %
Value
Value For Money
86 % 87.3 % +2%
User Rating
UBM User Rating
150 % Hugely more popular.
+95%
77 %
Price
Price (score)
$360 $200 Much cheaper.
+44%
Age
Newest
26 Months 26 Months
TDP
Thermal Design Power (TDP)
95 Watts 65 Watts Much more energy efficient.
+32%
Cores
CPU Processing Cores
6 cores 6 cores
Threads
CPU Processing Threads
12 threads Hugely higher thread count.
+100%
6 threads
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.7 GHz Much faster base frequency.
+32%
2.8 GHz
Turbo Clock
Turbo Clock Speed
4.7 GHz Faster turbo frequency.
+17%
4 GHz
64-Core
OC Multi Core Mixed Speed
1223 Pts Much faster OC 64-core speed.
+75%
699 Pts
64-Core
Avg. Multi Core Mixed Speed
1051 Pts Much faster 64-core speed.
+62%
648 Pts
Series
CPU Architecture
Coffee Lake Coffee Lake
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
UHD 630 UHD 630
Cache
Cache
12 MB 9 MB
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (130W) PCG 2015C (65W)
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.20 GHz 1.05 GHz
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
Yes No
TSX-NI
Intel® TSX-NI
Yes No
vPro Tech
Intel® vPro™ Technology ‡
Yes No
Stable Image Platform Program (SIPP)
Intel® Stable Image Platform Program (SIPP)
Yes No
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
Yes No

More specs » More specs »
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The i7-8700K is Intel’s latest, top of the range, 8th generation Coffee Lake processor. Like Kaby Lake and Sky Lake before that, Coffee Lake is based on Intel’s 14nm architecture which has been slightly optimized on each iteration. Following AMD’s modus operandi, Intel has upped the cores and threads across the range of their CPUs. In previous generations, a 6-core processor would have been a high-end desk-top (HEDT) processor, however the i7-8700K is the first Intel CPU with 6 cores and 12 threads to be classified (and priced) as a mainstream consumer processor. Specifically, the i7-8700K features a base clock speed of 3.7 GHz which boosts to 4.7 GHz (4.5 GHz for the previous generation i7-7700k), 12MB of smart (L3) cache and 2 channels of DDR4 RAM. The majority of the performance improvements over the 7th generation stem from the higher core count which results in a 50% increase in multi-core speed between the i7-7700k and i7-8700k. A new motherboard will need to be factored into the budget when upgrading to the 8700K as it requires a new Intel Z370 chipset which has supposedly been designed to better deliver power to CPUs with a greater number of cores. Also available in this latest release of CPUs is the 6 core 6 thread i5-8600k which is a more rational option (around $100 cheaper) for the vast majority of users that don’t require hyper-threading. Sandy bridge owners can finally justify an upgrade but with the next iteration of AMD's Zen architecture just around the corner the CPU market will be a lot faster moving now that Intel, once again, has to compete. [Sep '17 CPUPro]

MORE DETAILS

The i5-8400 is a competitively priced hex-core processor from Intel’s 8th generation of Core processors (Coffee Lake). Along with the release of the unlocked i5-8600K, this is the first time that six-core processors have featured in the i5 line-up. Like the other Coffee Lake processors, the i5-8400 is based upon an improved version of Intel’s 14nm architecture which featured in both Skylake and Kaby Lake. Early benchmarks reveal that for average quad core usage (most games employ a maximum of four cores) the i5-8400 performs way above its pay grade. It achieves quad core mixed speeds close to Intel’s outgoing 2017 flagship the $300, quad-core, 8 thread i7-7700k, which to date has been a strong favourite for high-end gaming setups. On paper, the i5-8400 has a base clock of 2.8 GHz (Intel are significantly downplaying the performance of this SKU by giving it a relatively low nominal base clock), an all core boost of 3.8 GHz (this is the effective base clock figure that counts) and a single core boost of 4 GHz. This compares reasonably well to the i5-8600K which has a base clock of 3.6 GHz, all core boost of 4.1 GHz and a single core boost of 4.3 GHz. The i5-8400 also features 9MB of L3 cache and an energy-thrifty TDP of 65W. Priced at under $190, the i5-8400 offers fantastic value for money. Unfortunately, like the other Coffee Lake processors, the i5-8400 will require a new 300 series motherboard, and at the time of writing, the only available version is Intel’s high-end Z370 which isn't an ideal pairing for the i5-8400. The Z series motherboards are designed to cater for the unlocked and overclockable "K" SKUs. Cheaper 300 series motherboards will be available in 2018 at which time the 8400 will offer even better value for money. [Oct '17 CPUPro]

MORE DETAILS

Processor Rankings (Price vs Performance) December 2019 CPU Rankings.

We calculate effective speed which measures real world performance for typical gamers and desktop users. Effective speed is adjusted by current prices to yield a value for money rating. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top CPUs. [CPUPro]

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  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
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