IntelBX80623I52500K
$246
IntelBX80684I58400
 $246 

4 Cores, 4 Threads
@3.3GHz Sandy Bridge (2011)

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

Real World Speed
Performance profile from 86,838 user samples
67,219 User Benchmarks
Best Bench: 90% Base clock 3.3 GHz, turbo 5 GHz (avg)
Worst Bench: 52% Base clock 3.3 GHz, turbo 0.6 GHz (avg)
Poor: 52% Great: 90%
SPEED RANK: 126th / 1117
Gaming
Gaming 71%
Battleship
Desktop
Desktop 69%
Battle cruiser
Workstation
Workstation 43%
Speed boat
19,619 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 78% Base clock 2.8 GHz, turbo 1.4 GHz (avg)
Poor: 78% Great: 94%
SPEED RANK: 33rd / 1117
Gaming
Gaming 90%
Aircraft carrier
Desktop
Desktop 87%
Aircraft carrier
Workstation
Workstation 65%
Battle cruiser
Effective Speed
Effective CPU Speed
70.8 % 89.6 % Faster effective speed.
+27%
SC Mixed
Avg. Single Core Mixed Speed
98.3 Pts 117 Pts Faster single-core speed.
+19%
QC Mixed
Avg. Quad Core Mixed Speed
365 Pts 454 Pts Faster quad-core speed.
+24%
MC Mixed
Avg. Multi Core Mixed Speed
373 Pts 665 Pts Much faster multi-core speed.
+78%
SC Mixed
OC Single Core Mixed Speed
120 Pts 123 Pts +2%
QC Mixed
OC Quad Core Mixed Speed
472 Pts 478 Pts +1%
MC Mixed
OC Multi Core Mixed Speed
475 Pts 708 Pts Much faster OC multi-core speed.
+49%
Market Share
Based on 9,730,417 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.65 % 1.47 % Hugely higher market share.
+126%
Value
Value For Money
75.4 % 109 % Much better value.
+44%
User Rating
UBM User Rating
64 % 108 % Much more popular.
+69%
Price
Price (score)
$246 $174 Cheaper.
+29%
Age
Newest
90 Months 9 Months Hugely more recent.
+90%
TDP
Thermal Design Power (TDP)
95 Watts 65 Watts Much more energy efficient.
+32%
Cores
CPU Processing Cores
4 cores 6 cores Much higher core count.
+50%
Threads
CPU Processing Threads
4 threads 6 threads Much higher thread count.
+50%
Lithography
Manufacturing process
32 nm 14 nm Much newer manufacturing.
+56%
Base Clock
Base Clock Speed
3.3 GHz Faster base frequency.
+18%
2.8 GHz
Turbo Clock
Turbo Clock Speed
3.7 GHz 4 GHz Slightly faster turbo frequency.
+8%
SC Int
Single Core Integer Speed
121 Pts +3% 118 Pts
SC Float
Single Core Floating Point Speed
121 Pts 128 Pts Slightly faster single-core fp speed.
+6%
QC Int
Quad Core Integer Speed
474 Pts +3% 462 Pts
QC Float
Quad Core Floating Point Speed
475 Pts 499 Pts Slightly faster quad-core fp speed.
+5%
MC Int
Multi Core Integer Speed
476 Pts 682 Pts Much faster multi-core int speed.
+43%
MC Float
Multi Core Floating Point Speed
477 Pts 740 Pts Much faster multi-core fp speed.
+55%
Series
CPU Architecture
Sandy Bridge (2011) Coffee Lake (2017)
Socket
Motherboard Socket
LGA1155 FCLGA1151
Graphics
Integrated Graphics
HD 3000 UHD 630
Launch Date
Launch Date
Q1'11 Q4'17
Cache
Cache
6 MB SmartCache 9 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX SSE4.1/4.2, AVX2
Lithography
Lithography
32 nm 14 nm
Bus Speed
Bus Speed
5 GT/s DMI 8 GT/s DMI3
Max Memory Size
Max Memory Size (dependent on memory type)
32 GB 64 GB
Memory Types
Memory Types
DDR3 1066/1333 DDR4-2666
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 3000 Intel® UHD Graphics 630
Graphics Base Frequency
Graphics Base Frequency
850 MHz 350 MHz
# of Displays Supported
# of Displays Supported ‡
2 3
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.1 GHz 1.05 GHz
Virtualization for Directed I/O (VT-d)
Intel® Virtualization Technology for Directed I/O (VT-d) ‡
No Yes
PCI Express Revision
PCI Express Revision
2.0 3.0

More specs » More specs »
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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]

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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 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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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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CPUGPUSSD
Intel Core i7-8700K $340Nvidia GTX 1070 $400Samsung 850 Evo 250GB $85
AMD Ryzen 5 1600 $160Nvidia GTX 1060-6GB $290Samsung 850 Evo 500GB $121
Intel Core i5-8600K $225AMD RX 480 $280Samsung 850 Pro 256GB $163
HDDRAMUSB
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