IntelBX80684I58400
IntelBX80646I54670K

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

4 Cores, 4 Threads
@3.4GHz Haswell (2013)

Real World Speed
Performance profile from 52,810 user samples
9,906 User Benchmarks
Best Bench: 96% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 85% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Poor: 85% Great: 96%
SPEED RANK: 30th / 1089
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 89%
Aircraft carrier
Workstation
Workstation 67%
Battle cruiser
42,904 User Benchmarks
Best Bench: 98% Base clock 4.9 GHz, turbo 7.05 GHz (avg)
Worst Bench: 65% Base clock 3.4 GHz
Poor: 65% Great: 98%
SPEED RANK: 55th / 1089
Gaming
Gaming 81%
Aircraft carrier
Desktop
Desktop 79%
Battleship
Workstation
Workstation 49%
Yacht
Effective Speed
Effective CPU Speed
92 % Slightly faster effective speed.
+13%
81.2 %
SC Mixed
Avg. Single Core Mixed Speed
120 Pts Slightly faster single-core speed.
+8%
111 Pts
QC Mixed
Avg. Quad Core Mixed Speed
467 Pts Slightly faster quad-core speed.
+11%
422 Pts
MC Mixed
Avg. Multi Core Mixed Speed
686 Pts Much faster multi-core speed.
+60%
430 Pts
SC Mixed
OC Single Core Mixed Speed
125 Pts 131 Pts +5%
QC Mixed
OC Quad Core Mixed Speed
487 Pts 518 Pts Slightly faster OC quad-core speed.
+6%
MC Mixed
OC Multi Core Mixed Speed
722 Pts Much faster OC multi-core speed.
+38%
522 Pts
Market Share
Based on 8,441,859 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.11 % Hugely higher market share.
+109%
0.53 %
Value
Value For Money
110 % Much better value.
+32%
83.5 %
User Rating
UBM User Rating
107 % Much more popular.
+47%
73 %
Price
Price (score)
$179 Much cheaper.
+34%
$270
Age
Newest
6 Months Hugely more recent.
+90%
58 Months
TDP
Thermal Design Power (TDP)
65 Watts More energy efficient.
+23%
84 Watts
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores
Threads
CPU Processing Threads
6 threads Much higher thread count.
+50%
4 threads
Lithography
Manufacturing process
14 nm Much newer manufacturing.
+36%
22 nm
Base Clock
Base Clock Speed
2.8 GHz 3.4 GHz Faster base frequency.
+21%
Turbo Clock
Turbo Clock Speed
4 GHz Slightly faster turbo frequency.
+5%
3.8 GHz
SC Int
Single Core Integer Speed
122 Pts 130 Pts Slightly faster single-core int speed.
+7%
SC Float
Single Core Floating Point Speed
129 Pts 130 Pts +1%
QC Int
Quad Core Integer Speed
475 Pts 517 Pts Slightly faster quad-core int speed.
+9%
QC Float
Quad Core Floating Point Speed
503 Pts 511 Pts +2%
MC Int
Multi Core Integer Speed
703 Pts Much faster multi-core int speed.
+36%
516 Pts
MC Float
Multi Core Floating Point Speed
744 Pts Much faster multi-core fp speed.
+44%
515 Pts
Series
CPU Architecture
Coffee Lake (2017) Haswell (2013)
Socket
Motherboard Socket
FCLGA1151 FCLGA1150
Graphics
Integrated Graphics
UHD 630 HD 4600
Launch Date
Launch Date
Q4'17 Q2'13
Cache
Cache
9 MB 6 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX 2.0
Lithography
Lithography
14 nm 22 nm
Recommended Price
Recommended Customer Price
N/A $242.00 - $243.00
Bus Speed
Bus Speed
8 GT/s DMI3 5 GT/s DMI2
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (65W) PCG 2013D
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 32 GB
Memory Types
Memory Types
DDR4-2666 DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 4600
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.05 GHz 1.2 GHz
Graphics Video Max Memory
Graphics Video Max Memory
64 GB 2 GB
Virtualization for Directed I/O (VT-d)
Intel® Virtualization Technology for Directed I/O (VT-d) ‡
Yes No
PCI Express Revision
PCI Express Revision
3.0 Up to 3.0
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16 or 2x8 or 1x8+2x4 Up to 1x16, 2x8, 1x8+2x4

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 Intel Core i5-4670K is the latest middle tier desktop processor from the fourth generation of Intel's Core range codenamed "Haswell". In terms of raw performance this processor slightly bests its predecessor the 3570K achieving approximately 10% higher server benchmark scores. In terms of real world performance the single core improvements are more relevant as more than two cores are rarely used for most typical consumer tasks and these have also improved by around 10% over the 3570K. It's not all good news though as the price increase of 14% more than offsets the performance improvements. This processor currently represents approximately the same value for money as its predecessor, the i5-3570K. [Jun '13 CPUPro]

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Processor Rankings (Price vs Performance) April 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.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
  • Best value for money - Value for money is based on real world performance and price.
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