IntelBX80684I58400
IntelBX80623I52500K
$246

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

 $246 

4 Cores, 4 Threads @3.3GHz, Sandy Bridge.
Release date: Q1 2011.

Real World Speed
Performance profile from 107,630 user samples
41,134 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 79% Base clock 2.8 GHz, turbo 2.8 GHz (avg)
Poor: 79% Great: 94%
SPEED RANK: 33rd / 1129
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 65%
Destroyer
66,496 User Benchmarks
Best Bench: 89% Base clock 3.3 GHz, turbo 5 GHz (avg)
Worst Bench: 52% Base clock 3.3 GHz, turbo 3.3 GHz (avg)
Poor: 52% Great: 89%
SPEED RANK: 130th / 1129
Gaming
Gaming 71%
Battleship
Desktop
Desktop 69%
Battle cruiser
Workstation
Workstation 43%
Speed boat
Effective Speed
Effective CPU Speed
89.3 % Faster effective speed.
+26%
70.6 %
SC Mixed
Avg. Single Core Mixed Speed
117 Pts Faster single-core speed.
+20%
97.9 Pts
QC Mixed
Avg. Quad Core Mixed Speed
453 Pts Faster quad-core speed.
+24%
365 Pts
MC Mixed
Avg. Multi Core Mixed Speed
656 Pts Much faster multi-core speed.
+76%
372 Pts
SC Mixed
OC Single Core Mixed Speed
123 Pts +2% 121 Pts
QC Mixed
OC Quad Core Mixed Speed
478 Pts +1% 472 Pts
MC Mixed
OC Multi Core Mixed Speed
704 Pts Much faster OC multi-core speed.
+49%
473 Pts
Market Share
Based on 11,528,687 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.36 % Hugely higher market share.
+109%
0.65 %
Value
Value For Money
97.8 % Much better value.
+30%
75.2 %
User Rating
UBM User Rating
114 % Much more popular.
+65%
69 %
Price
Price (score)
$229 Slightly cheaper.
+7%
$246
Age
Newest
12 Months Hugely more recent.
+87%
93 Months
TDP
Thermal Design Power (TDP)
65 Watts Much more energy efficient.
+32%
95 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.
+56%
32 nm
Base Clock
Base Clock Speed
2.8 GHz 3.3 GHz Faster base frequency.
+18%
Turbo Clock
Turbo Clock Speed
4 GHz Slightly faster turbo frequency.
+8%
3.7 GHz
SC Int
Single Core Integer Speed
118 Pts 120 Pts +2%
SC Float
Single Core Floating Point Speed
128 Pts Slightly faster single-core fp speed.
+6%
121 Pts
QC Int
Quad Core Integer Speed
461 Pts 470 Pts +2%
QC Float
Quad Core Floating Point Speed
500 Pts Slightly faster quad-core fp speed.
+7%
466 Pts
MC Int
Multi Core Integer Speed
677 Pts Much faster multi-core int speed.
+44%
471 Pts
MC Float
Multi Core Floating Point Speed
740 Pts Much faster multi-core fp speed.
+56%
474 Pts
Series
CPU Architecture
Coffee Lake Sandy Bridge
Socket
Motherboard Socket
FCLGA1151 LGA1155
Graphics
Integrated Graphics
UHD 630 HD 3000
Launch Date
Launch Date
Q4'17 Q1'11
Cache
Cache
9 MB 6 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX
Lithography
Lithography
14 nm 32 nm
Bus Speed
Bus Speed
8 GT/s DMI3 5 GT/s DMI
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 32 GB
Memory Types
Memory Types
DDR4-2666 DDR3 1066/1333
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 3000
Graphics Base Frequency
Graphics Base Frequency
350 MHz 850 MHz
# of Displays Supported
# of Displays Supported ‡
3 2
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.05 GHz 1.1 GHz
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 2.0

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]

MORE DETAILS

The i5-2500K is a second generation Sandy Bridge processor which is currently two generations old and nearly three years out of date. The many users that had the good sense to purchase this processor should feel in no hurry to upgrade as it's still no slouch, even by today's standards. The benchmark figures indicate that, even at stock clock rates, in terms of real-world performance this processor is approximately 20% slower than the best currently available, not bad considering its age. Given that the 2500K has an unlocked multiplier upping its performance by 10% with stock cooling should not pose much of a problem for the majority of owners. Here is a detailed performance comparison of the 2500K vs 4670K.  [Jul '13 CPUPro]

MORE DETAILS

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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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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