IntelBX80677I77700K
IntelBX80684I58400

4 Cores, 8 Threads
@4.2GHz Kaby Lake (2017)

6 Cores, 6 Threads
@2.8GHz Coffee Lake (2017)

Real World Speed
Performance profile from 186,563 user samples
165,202 User Benchmarks
Best Bench: 108% Base clock 4.2 GHz, turbo 5.3 GHz (avg)
Worst Bench: 84% Base clock 4.2 GHz, turbo 0.65 GHz (avg)
Poor: 84% Great: 108%
SPEED RANK: 20th / 1117
Gaming
Gaming 96%
Nuclear submarine
Desktop
Desktop 97%
Nuclear submarine
Workstation
Workstation 72%
Battleship
21,361 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 82% Base clock 2.8 GHz, turbo 1.4 GHz (avg)
Poor: 82% Great: 94%
SPEED RANK: 33rd / 1117
Gaming
Gaming 90%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 65%
Battle cruiser
Effective Speed
Effective CPU Speed
95.8 % Slightly faster effective speed.
+7%
89.6 %
SC Mixed
Avg. Single Core Mixed Speed
136 Pts Faster single-core speed.
+16%
117 Pts
QC Mixed
Avg. Quad Core Mixed Speed
465 Pts +2% 455 Pts
MC Mixed
Avg. Multi Core Mixed Speed
726 Pts Slightly faster multi-core speed.
+10%
661 Pts
SC Mixed
OC Single Core Mixed Speed
151 Pts Faster OC single-core speed.
+23%
123 Pts
QC Mixed
OC Quad Core Mixed Speed
544 Pts Slightly faster OC quad-core speed.
+14%
478 Pts
MC Mixed
OC Multi Core Mixed Speed
806 Pts Slightly faster OC multi-core speed.
+14%
706 Pts
Market Share
Based on 9,795,562 CPUs tested.
Market Share
Market Share (trailing 30 days)
2.33 % Much higher market share.
+60%
1.46 %
Value
Value For Money
94.8 % 108 % Slightly better value.
+13%
User Rating
UBM User Rating
123 % Slightly more popular.
+15%
107 %
Price
Price (score)
$300 $179 Much cheaper.
+40%
Age
Newest
18 Months 9 Months Much more recent.
+50%
TDP
Thermal Design Power (TDP)
91 Watts 65 Watts More energy efficient.
+29%
Cores
CPU Processing Cores
4 cores 6 cores Much higher core count.
+50%
Threads
CPU Processing Threads
8 threads Much higher thread count.
+33%
6 threads
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
4.2 GHz Much faster base frequency.
+50%
2.8 GHz
Turbo Clock
Turbo Clock Speed
4.5 GHz Slightly faster turbo frequency.
+12%
4 GHz
SC Int
Single Core Integer Speed
147 Pts Faster single-core int speed.
+24%
119 Pts
SC Float
Single Core Floating Point Speed
156 Pts Faster single-core fp speed.
+22%
128 Pts
QC Int
Quad Core Integer Speed
532 Pts Faster quad-core int speed.
+15%
461 Pts
QC Float
Quad Core Floating Point Speed
564 Pts Slightly faster quad-core fp speed.
+13%
500 Pts
MC Int
Multi Core Integer Speed
746 Pts Slightly faster multi-core int speed.
+10%
681 Pts
MC Float
Multi Core Floating Point Speed
852 Pts Faster multi-core fp speed.
+15%
740 Pts
Series
CPU Architecture
Kaby Lake (2017) Coffee Lake (2017)
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
HD 630 UHD 630
Launch Date
Launch Date
Q1'17 Q4'17
Cache
Cache
8 MB 9 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX 2.0 SSE4.1/4.2, AVX2
Recommended Price
Recommended Customer Price
$339.00 - $350.00 N/A
Thermal Solution Specification
Thermal Solution Specification
PCG 2015D (130W) PCG 2015C (65W)
Memory Types
Memory Types
DDR4-2133/2400, DDR3L-1333/1600 @ 1.35V DDR4-2666
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 630 Intel® UHD Graphics 630
Graphics Base Frequency
Graphics Base Frequency
350.00 MHz 350 MHz
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.15 GHz 1.05 GHz
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
Yes No
TSX-NI
Intel® TSX-NI
Yes No
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16, 2x8, 1x8+2x4 Up to 1x16 or 2x8 or 1x8+2x4

More specs » More specs »
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The Core i7-7700K is Intel’s flagship Kaby Lake based CPU which is reported to have the same IPC as its predecessor, Skylake. Comparing the 7700K and 6700K shows that both average effective speed and peak overclocked speed are up by 7%. Most of the increase in average effective speed is explained by the 5% boost in base clocks from 4.0 to 4.2 GHz. The improved peak lab speed is attributable to a combination of better overclocking capacity and improvements in Intel’s speedshift technology which make the 7700K slightly more responsive. Kaby Lake also has marginally better HD 630 integrated graphics. The i7-7700K is priced similarly to the i7-6700K so for top end gaming and workstation builds, the 7700K is the clear choice for 2017. AMD’s Ryzen will release later this year so things could change at that time. [Jan '17 CPUPro]

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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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Processor Rankings (Price vs Performance) July 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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Group Test Results

  • 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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Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

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  • - CPU tests include: integer, floating and string.
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  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
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CPUGPUSSD
Intel Core i7-8700K $310Nvidia GTX 1070 $408Samsung 850 Evo 250GB $100
AMD Ryzen 5 1600 $150Nvidia GTX 1060-6GB $289Samsung 850 Evo 500GB $121
Intel Core i5-8600K $235AMD RX 480 $280Samsung 850 Pro 256GB $160
HDDRAMUSB
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $176SanDisk Extreme 64GB $44
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $951SanDisk Extreme 32GB $46
Seagate Barracuda 2TB (2016) $59HyperX Fury DDR4 2133 C14 2x8GB $219SanDisk Ultra Fit 32GB $12
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