IntelBX80684I58400
IntelBX80684I78700K

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

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

Real World Speed
Performance profile from 181,823 user samples
40,649 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 77% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Poor: 77% Great: 94%
SPEED RANK: 34th / 1129
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 64%
Destroyer
141,174 User Benchmarks
Best Bench: 125% Base clock 3.7 GHz, turbo 5.15 GHz (avg)
Worst Bench: 90% Base clock 3.7 GHz, turbo 1.65 GHz (avg)
Poor: 90% Great: 125%
SPEED RANK: 10th / 1129
Gaming
Gaming 108%
UFO
Desktop
Desktop 105%
UFO
Workstation
Workstation 96%
Nuclear submarine
Effective Speed
Effective CPU Speed
88.8 % 108 % Faster effective speed.
+22%
SC Mixed
Avg. Single Core Mixed Speed
117 Pts 138 Pts Faster single-core speed.
+18%
QC Mixed
Avg. Quad Core Mixed Speed
451 Pts 525 Pts Faster quad-core speed.
+16%
MC Mixed
Avg. Multi Core Mixed Speed
651 Pts 1085 Pts Much faster multi-core speed.
+67%
SC Mixed
OC Single Core Mixed Speed
122 Pts 155 Pts Faster OC single-core speed.
+27%
QC Mixed
OC Quad Core Mixed Speed
476 Pts 616 Pts Faster OC quad-core speed.
+29%
MC Mixed
OC Multi Core Mixed Speed
701 Pts 1248 Pts Much faster OC multi-core speed.
+78%
Market Share
Based on 11,488,738 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.09 % 4.3 % Hugely higher market share.
+294%
Value
Value For Money
102 % +3% 99 %
User Rating
UBM User Rating
115 % 156 % Much more popular.
+36%
Price
Price (score)
$202 Much cheaper.
+45%
$370
Age
Newest
12 Months 12 Months
TDP
Thermal Design Power (TDP)
65 Watts Much more energy efficient.
+32%
95 Watts
Cores
CPU Processing Cores
6 cores 6 cores
Threads
CPU Processing Threads
6 threads 12 threads Hugely higher thread count.
+100%
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
2.8 GHz 3.7 GHz Much faster base frequency.
+32%
Turbo Clock
Turbo Clock Speed
4 GHz 4.7 GHz Faster turbo frequency.
+17%
SC Int
Single Core Integer Speed
118 Pts 151 Pts Faster single-core int speed.
+28%
SC Float
Single Core Floating Point Speed
128 Pts 160 Pts Faster single-core fp speed.
+25%
QC Int
Quad Core Integer Speed
460 Pts 598 Pts Much faster quad-core int speed.
+30%
QC Float
Quad Core Floating Point Speed
499 Pts 638 Pts Faster quad-core fp speed.
+28%
MC Int
Multi Core Integer Speed
676 Pts 1150 Pts Much faster multi-core int speed.
+70%
MC Float
Multi Core Floating Point Speed
738 Pts 1323 Pts Much faster multi-core fp speed.
+79%
Series
CPU Architecture
Coffee Lake Coffee Lake
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
UHD 630 UHD 630
Cache
Cache
9 MB 12 MB
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (65W) PCG 2015C (130W)
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.05 GHz 1.20 GHz
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
No Yes
TSX-NI
Intel® TSX-NI
No Yes
vPro Tech
Intel® vPro™ Technology ‡
No Yes
Stable Image Platform Program (SIPP)
Intel® Stable Image Platform Program (SIPP)
No Yes
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
No Yes

More specs » More specs »
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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]

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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]

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Processor Rankings (Price vs Performance) October 2018 CPU Rankings.

We calculate effective speed which measures real world performance for typical consumers. Effective speed is adjusted by current prices to yield a value for money rating which is geared towards gamers. 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 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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CPUGPUSSD
Intel Core i7-8700K $370Nvidia GTX 1070 $329Samsung 850 Evo 250GB $78
AMD Ryzen 5 1600 $155Nvidia GTX 1060-6GB $220Samsung 850 Evo 500GB $115
Intel Core i7-7700K $355AMD RX 480 $280Samsung 850 Pro 256GB $163
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $140SanDisk Extreme 64GB $42
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $869SanDisk Extreme 32GB $30
Seagate Barracuda 2TB (2016) $55Corsair Vengeance LPX DDR4 3200 C16 2x8GB $145SanDisk Ultra Fit 32GB $12
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