IntelBX80646I74790K
$348
IntelBX80684I58400
 $348 

4 Cores, 8 Threads @4.0GHz, Haswell.
Release date: Q2 2014.

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

Real World Speed
Performance profile from 464,843 user samples
289,811 User Benchmarks
Best Bench: 94% Base clock 4 GHz, turbo 4.95 GHz (avg)
Worst Bench: 71% Base clock 4 GHz, turbo 1.25 GHz (avg)
Poor: 71% Great: 94%
SPEED RANK: 89th / 1256
Gaming
Gaming 84%
Aircraft carrier
Desktop
Desktop 88%
Aircraft carrier
Workstation
Workstation 69%
Battle cruiser
175,032 User Benchmarks
Best Bench: 91% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 72% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Poor: 72% Great: 91%
SPEED RANK: 77th / 1256
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 70%
Battleship
Effective Speed
Effective CPU Speed
84.2 % 85.3 % +1%
Memory
Avg. Memory Latency
91.1 Pts +2% 89.2 Pts
1-Core
Avg. Single Core Mixed Speed
123 Pts Slightly faster single-core speed.
+7%
115 Pts
2-Core
Avg. Dual Core Mixed Speed
237 Pts +4% 227 Pts
4-Core
Avg. Quad Core Mixed Speed
419 Pts 442 Pts Slightly faster quad-core speed.
+5%
8-Core
Avg. Octa Core Mixed Speed
618 Pts 625 Pts +1%
Memory
OC Memory Latency
97.6 Pts +2% 95.5 Pts
1-Core
OC Single Core Mixed Speed
137 Pts Faster OC single-core speed.
+12%
122 Pts
2-Core
OC Dual Core Mixed Speed
272 Pts Faster OC dual-core speed.
+12%
242 Pts
4-Core
OC Quad Core Mixed Speed
511 Pts Slightly faster OC quad-core speed.
+8%
475 Pts
8-Core
OC Octa Core Mixed Speed
711 Pts +3% 690 Pts
Market Share
Based on 30,627,412 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.88 % 0.91 % +3%
Value
Value For Money
79.2 % 98.5 % Better value.
+24%
User Rating
UBM User Rating
160 % Hugely more popular.
+88%
85 %
Price
Price (score)
$348 $165 Much cheaper.
+53%
Age
Newest
73 Months 33 Months Much more recent.
+55%
TDP
Thermal Design Power (TDP)
88 Watts 65 Watts More energy efficient.
+26%
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
22 nm 14 nm Much newer manufacturing.
+36%
Base Clock
Base Clock Speed
4 GHz Much faster base frequency.
+43%
2.8 GHz
Turbo Clock
Turbo Clock Speed
4.4 GHz Faster turbo frequency.
+10%
4 GHz
64-Core
OC Multi Core Mixed Speed
711 Pts +2% 696 Pts
64-Core
Avg. Multi Core Mixed Speed
623 Pts 632 Pts +1%
Series
CPU Architecture
Haswell Coffee Lake
Socket
Motherboard Socket
FCLGA1150 FCLGA1151
Graphics
Integrated Graphics
HD 4600 UHD 630
Launch Date
Launch Date
Q2'14 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
Lithography
Lithography
22 nm 14 nm
Recommended Price
Recommended Customer Price
$339.00 - $350.00 N/A
Max Turbo Frequency
Max Turbo Frequency
4.4 GHz 4.00 GHz
Bus Speed
Bus Speed
5 GT/s DMI2 8 GT/s DMI3
Thermal Solution Specification
Thermal Solution Specification
PCG 2013D PCG 2015C (65W)
Max Memory Size
Max Memory Size (dependent on memory type)
32 GB 64 GB
Memory Types
Memory Types
DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V DDR4-2666
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 4600 Intel® UHD Graphics 630
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.25 GHz 1.05 GHz
Graphics Video Max Memory
Graphics Video Max Memory
2 GB 64 GB
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
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 Intel Core i7-4790K, codenamed Devil's Canyon, is an upgraded 4770K, Intel's current flagship i7. The 4790K features an improved thermal interface which enables it to dissipate heat more efficiently than the 4770K. Comparing the 4770K and 4790K shows that stock performance has improved by 13% which is consistent with the base clock jump from 3.5 GHz to 4.0 GHz. OC performance remains unchanged. Comparing the 4790K and 4790 shows that at stock clocks the 4790K is around 16% faster which considering the small price difference makes the 4790K a far better choice. Previously Intel targeted the unlocked K versions at overclockers but with Devil's Canyon they have included VT-d on the K chip and this time it's squarely aimed at both power users and overclockers alike. Until the release of Broadwell in six months, the 4790K is the high end CPU of choice. [Jul '14 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 2020 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]

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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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 Frequently Asked Questions

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