UserBenchmark: Intel Core i5-8400 vs i7-6700K

CPU
RANKINGS

TEST
YOUR CPU

ADD TO PC
BUILD

IntelBX80662I76700K

BUY • $180

IntelBX80684I58400

BUY • $131

BenchYourCPU

Real World Speed

Performance profile from 901,198 user samples

Benchmark your CPU here

588,978 User Benchmarks

Best Bench: 90% Base clock 4 GHz, turbo 4.8 GHz (avg)
Worst Bench: 70% Base clock 4 GHz, turbo 0.8 GHz (avg)

Poor: 70% Great: 90%

SPEED RANK: 224^th / 1442

Gaming 81%

Aircraft carrier

Desktop 85%

Aircraft carrier

Workstation 67%

Battle cruiser

312,220 User Benchmarks

Best Bench: 89% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 61% Base clock 2.8 GHz, turbo 0.8 GHz (avg)

Poor: 61% Great: 89%

SPEED RANK: 212^th / 1442

Gaming 82%

Aircraft carrier

Desktop 83%

Aircraft carrier

Workstation 66%

Battle cruiser


Effective Speed Effective CPU Speed		80.8 %			81.8 %	+1%


Memory Avg. Memory Latency	88.6 Pts	+4%	84.9 Pts
1-Core Avg. Single Core Speed	119 Pts	Slightly faster single-core speed. +5%	113 Pts
2-Core Avg. Dual Core Speed	224 Pts		224 Pts
4-Core Avg. Quad Core Speed	395 Pts		434 Pts	Slightly faster quad-core speed. +10%
8-Core Avg. Octa Core Speed	597 Pts	Slightly faster octa-core speed. +6%	564 Pts


Memory OC Memory Latency	95.9 Pts	+2%	94.2 Pts
1-Core OC Single Core Speed	137 Pts	Faster OC single-core speed. +14%	120 Pts
2-Core OC Dual Core Speed	258 Pts	Slightly faster OC dual-core speed. +9%	237 Pts
4-Core OC Quad Core Speed	459 Pts		471 Pts	+3%
8-Core OC Octa Core Speed	696 Pts	Slightly faster OC octa-core speed. +6%	657 Pts

Market Share

Based on 67,721,639 CPUs tested

See market share leaders


Market Share Market Share (trailing 30 days)	1.03 %	Higher market share. +16%	0.89 %
Value Value For Money	91.1 %		101 %	Better value. +11%
User Rating UBM User Rating	78 %	More popular. +28%	61 %
Price Price (score)	$180		$131	Cheaper. +27%


Age Newest	104 Months		78 Months	More recent. +25%
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 GHz	Much faster base frequency. +43%	2.8 GHz
Turbo Clock Turbo Clock Speed	4.2 GHz	+5%	4 GHz
64-Core OC Multi Core Speed	716 Pts	Slightly faster OC 64-core speed. +6%	675 Pts
64-Core Avg. Multi Core Speed	612 Pts	+4%	588 Pts


Series CPU Architecture	Skylake	Coffee Lake
Socket Motherboard Socket	FCLGA1151	FCLGA1151
Graphics Integrated Graphics	HD 530	UHD 630
Launch Date Launch Date	Q3'15	Q4'17
Cache Cache	8 MB SmartCache	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
Max Turbo Frequency Max Turbo Frequency	4.2 GHz	4.00 GHz
Thermal Solution Specification Thermal Solution Specification	PCG 2015D (130W)	PCG 2015C (65W)
Memory Types Memory Types	DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V	DDR4-2666
Processor Graphics Processor Graphics ‡	Intel® HD Graphics 530	Intel® UHD Graphics 630
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 »

The Core i7-6700K is Intel's latest "Skylake" flagship processor. It replaces the hugely successful i7-4790K and takes the crown as the fastest mainstream consumer CPU available. Comparing performance and specs between the 4790K and 6700K shows that the configuration is largely unchanged (same base clocks, cores, threads) but the improved manufacturing process (14nm) brings a small reduction in TDP and a performance improvement of 8%; almost exactly the same jump as between the Ivy Bridge 3770K and Haswell 4770K. Owners of any unlocked-K Intel CPU from Sandy Bridge or onwards still have no real reason to upgrade as the performance improvements are largely academic but the i7-6700K will be the CPU of choice for the vast majority of top end PC builds in 2015. ^{[Aug '15 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

Systems with these CPUs

Top Builds that include these CPUs

Custom PC Builder (Start a new build) Build your perfect PC: compare component prices, popularity, speed and value for money

CHOOSE A COMPONENT:

CPU

GPU

SSD

HDD

RAM

MBD

Processor Rankings (Price vs Performance) April 2024 CPU Rankings

We calculate effective speed which measures real world performance for typical 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]

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.

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

Welcome to our 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 value for money upgrades.

UserBenchmark of the month

Gaming

Desktop

ProGaming

CPU

GPU

SSD

HDD

RAM

USB

How it works

- Download and run UserBenchmark
- CPU tests include: integer, floating and string
- GPU tests include: six 3D game simulations
- Drive tests include: read, write, sustained write and mixed IO
- RAM tests include: single/multi core bandwidth and latency
- SkillBench (space shooter) tests user input accuracy
- 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 current market leaders
- Explore your best upgrade options with a virtual PC build
- Compare your in-game FPS to other users with your hardware

Frequently Asked Questions

Processors FAQ

AMD vs Intel: Gaming performance 2012-2021

How does IPC compare between AMD's Ryzen and Intel's Kaby Lake?

What is multi core mixed speed?

What is multi core integer speed?

What is multi core floating point speed?

What is single core mixed CPU speed?

What is quad core mixed CPU speed?

What is quad core floating point speed?

What is quad core integer speed?

What is single core floating point speed?

What is single core integer speed?

What is the GeekBench single core score?

What is a CPU?

What is the effective CPU speed index?

What is overclocking?

What is thermal design power (TDP)?

ALL FAQs »

CPU	GPU	SSD
Intel Core i5-13600K $279	Nvidia RTX 4060 $300	Crucial MX500 250GB $40
Intel Core i5-12400F $133	Nvidia RTX 4060-Ti $385	Samsung 850 Evo 120GB $80
Intel Core i5-12600K $182	Nvidia RTX 4070 $409	Samsung 860 Evo 250GB $52

HDD	RAM	USB
Seagate Barracuda 1TB (2016) $39	Corsair Vengeance LPX DDR4 3200 C16 2x8GB $40	SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $30	Corsair Vengeance LPX DDR4 3000 C15 2x8GB $43	SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $51	G.SKILL Trident Z DDR4 3200 C14 4x16GB $351	SanDisk Ultra Fit 32GB $16

MORE DETAILS

MORE DETAILS

CHOOSE A COMPONENT:

Group Test Results

UserBenchmark of the month

How it works

Frequently Asked Questions

Best User Rated

Feedback