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 87,184 user samples
86,986 User Benchmarks
Best Bench: 112% Base clock 4.2 GHz, turbo 5 GHz (avg)
Worst Bench: 89% Base clock 4.2 GHz, turbo 0.8 GHz (avg)
Poor: 89% Great: 112%
SPEED RANK: 12th / 980
Gaming
Gaming 100%
UFO
Desktop
Desktop 101%
UFO
Workstation
Workstation 74%
Battleship
198 User Benchmarks
Best Bench: 97% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 88% Base clock 2.7 GHz, turbo 2.7 GHz (avg)
Poor: 88% Great: 97%
SPEED RANK: 22nd / 980
Gaming
Gaming 93%
Nuclear submarine
Desktop
Desktop 89%
Aircraft carrier
Workstation
Workstation 68%
Battle cruiser
Effective Speed
Effective CPU Speed
100 % Slightly faster effective speed.
+7%
93.4 % -7%
SC Mixed
Avg. Single Core Mixed Speed
140 Pts Faster single-core speed.
+16%
121 Pts -16%
QC Mixed
Avg. Quad Core Mixed Speed
493 Pts +4% 475 Pts -4%
MC Mixed
Avg. Multi Core Mixed Speed
742 Pts Slightly faster multi-core speed.
+6%
699 Pts -6%
SC Mixed
OC Single Core Mixed Speed
155 Pts Faster OC single-core speed.
+23%
126 Pts -23%
QC Mixed
OC Quad Core Mixed Speed
573 Pts Faster OC quad-core speed.
+16%
492 Pts -16%
MC Mixed
OC Multi Core Mixed Speed
828 Pts Slightly faster OC multi-core speed.
+13%
733 Pts -13%
Market Share
Based on 5,465,458 CPUs tested.
Market Share
Market Share (trailing 30 days)
6.19 % Insanely higher market share.
+1,897%
0.31 % -1,897%
Value
Value For Money
99.2 % Slightly better value.
+9%
91.2 % -9%
User Rating
UBM User Rating
158 % Hugely more popular.
+177%
57 % -177%
Price
Price (score)
$300 +3% $310 -3%
Age
Newest
9 Months -100% 0 Months Hugely more recent.
+100%
TDP
Thermal Design Power (TDP)
91 Watts -29% 65 Watts More energy efficient.
+29%
Cores
CPU Processing Cores
4 cores -50% 6 cores Much higher core count.
+50%
Threads
CPU Processing Threads
8 threads Much higher thread count.
+33%
6 threads -33%
Lithography
Manufacturing process
14 nm 0% 14 nm 0%
Base Clock
Base Clock Speed
4.2 GHz Much faster base frequency.
+50%
2.8 GHz -50%
Turbo Clock
Turbo Clock Speed
4.5 GHz Slightly faster turbo frequency.
+12%
4 GHz -12%
SC Int
Single Core Integer Speed
152 Pts Faster single-core int speed.
+24%
123 Pts -24%
SC Float
Single Core Floating Point Speed
158 Pts Faster single-core fp speed.
+22%
130 Pts -22%
QC Int
Quad Core Integer Speed
560 Pts Faster quad-core int speed.
+17%
479 Pts -17%
QC Float
Quad Core Floating Point Speed
589 Pts Faster quad-core fp speed.
+16%
506 Pts -16%
MC Int
Multi Core Integer Speed
762 Pts Slightly faster multi-core int speed.
+7%
713 Pts -7%
MC Float
Multi Core Floating Point Speed
865 Pts Slightly faster multi-core fp speed.
+15%
753 Pts -15%
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) October 2017 CPU Rankings.

Welcome to our desktop CPU comparison. We calculate effective speed which measures real world performance for typical consumers. Effective speed is adjusted by price to yield a value for money rating which is geared towards gamers. Calculated values don't always paint the whole picture so we check them against hundreds of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top CPUs. [CPUPro]

How Fast Is Your CPU? (Bench your build) Size up your PC in less than a minute.

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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How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.

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CPUGPUSSD
Intel Core i7-7700K $300Nvidia GTX 1070 $380Samsung 850 Evo 250GB $98
AMD Ryzen 7 1700 $280AMD RX 480 $491Samsung 850 Pro 256GB $120
Intel Core i5-7600K $220Nvidia GTX 1060-6GB $260Samsung 850 Evo 500GB $159
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $163SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $842SanDisk Extreme 32GB $22
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $180SanDisk Ultra Fit 32GB $13
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