4 Cores, 8 Threads
@3.4GHz Sandy Bridge (2011)

6 Cores, 6 Threads
@3.6GHz Coffee Lake (2017)

Real World Speed
Performance profile from 53,947 user samples
38,291 User Benchmarks
Best Bench: 89% Base clock 3.4 GHz, turbo 5 GHz (avg)
Worst Bench: 55% Base clock 3.4 GHz, turbo 1.1 GHz (avg)
Poor: 55% Great: 89%
SPEED RANK: 107th / 1052
Gaming 71%
Desktop 72%
Workstation 51%
15,656 User Benchmarks
Best Bench: 121% Base clock 3.6 GHz, turbo 5.25 GHz (avg)
Worst Bench: 93% Base clock 3.6 GHz, turbo 0.8 GHz (avg)
Poor: 93% Great: 121%
SPEED RANK: 9th / 1052
Gaming 104%
Desktop 100%
Workstation 76%
Effective Speed
Effective CPU Speed
71 % 104 % Much faster effective speed.
SC Mixed
Avg. Single Core Mixed Speed
101 Pts 135 Pts Much faster single-core speed.
QC Mixed
Avg. Quad Core Mixed Speed
348 Pts 532 Pts Much faster quad-core speed.
MC Mixed
Avg. Multi Core Mixed Speed
511 Pts 777 Pts Much faster multi-core speed.
SC Mixed
OC Single Core Mixed Speed
122 Pts 157 Pts Faster OC single-core speed.
QC Mixed
OC Quad Core Mixed Speed
451 Pts 618 Pts Much faster OC quad-core speed.
MC Mixed
OC Multi Core Mixed Speed
625 Pts 901 Pts Much faster OC multi-core speed.
Market Share
Based on 7,906,321 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.75 % 1.42 % Hugely higher market share.
Value For Money
66.8 % 113 % Much better value.
User Rating
UBM User Rating
74 % 130 % Much more popular.
Price (score)
$343 $235 Much cheaper.
86 Months 5 Months Hugely more recent.
Thermal Design Power (TDP)
95 Watts 95 Watts
CPU Processing Cores
4 cores 6 cores Much higher core count.
CPU Processing Threads
8 threads Much higher thread count.
6 threads
Manufacturing process
32 nm 14 nm Much newer manufacturing.
Base Clock
Base Clock Speed
3.4 GHz 3.6 GHz Slightly faster base frequency.
Turbo Clock
Turbo Clock Speed
3.8 GHz 4.3 GHz Slightly faster turbo frequency.
SC Int
Single Core Integer Speed
122 Pts 152 Pts Faster single-core int speed.
SC Float
Single Core Floating Point Speed
122 Pts 162 Pts Much faster single-core fp speed.
QC Int
Quad Core Integer Speed
453 Pts 598 Pts Much faster quad-core int speed.
QC Float
Quad Core Floating Point Speed
456 Pts 646 Pts Much faster quad-core fp speed.
MC Int
Multi Core Integer Speed
603 Pts 878 Pts Much faster multi-core int speed.
MC Float
Multi Core Floating Point Speed
622 Pts 953 Pts Much faster multi-core fp speed.
CPU Architecture
Sandy Bridge (2011) Coffee Lake (2017)
Motherboard Socket
LGA1155 FCLGA1151
Integrated Graphics
HD 3000 UHD 630
Launch Date
Launch Date
Q1'11 Q4'17
8 MB SmartCache 9 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX SSE4.1/4.2, AVX2
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
1.35 GHz 1.15 GHz
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
Yes No
Virtualization for Directed I/O (VT-d)
Intel® Virtualization Technology for Directed I/O (VT-d) ‡
No Yes
vPro Tech
Intel® vPro™ Technology ‡
No Yes
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
No Yes
PCI Express Revision
PCI Express Revision
2.0 3.0

More specs » More specs »

The i7-2600K Sandy Bridge processor is two generations old and nearly three years out of date. The numerous owners of this superb processor should feel in no hurry to upgrade as it's still one of the fastest consumer processors, even by today's standards. The benchmark figures indicate that in terms of real-world performance this processor is only 5% slower than the third generation Ivy Bridge i7-3770K, not bad considering its age. That said new buyers will find both better energy efficiency and marginal performance improvements elsewhere[Feb '12 CPUPro]


The unlocked hex-core i5-8600K from Intel’s latest Coffee Lake generation of processors is the new flagship of the i5 series, succeeding the Kaby Lake quad-core i5-7600K. The 8th generation of processors brings the largest performance uplift since Sandy Bridge by adding more cores at each of the i3, i5 and i7 product lines. Like the other Coffee Lake processors, the i5-8600K is built upon optimized 14nm architecture, marginally improved upon from Kaby Lake and Skylake. The 8600K has a 95W TDP and a nominal stock clock of 3.6 GHz, which boosts to 4.1 GHz for all six cores, 4.2 GHz for dual/quad and 4.3 GHz for single core. Early benchmarks put the i5-8600K’s effective speed 15% ahead of the i5-7600K. A 50% increase in multi-core speed is explained by two additional cores and thanks to the quad-core clock bump from 4 GHz on the 7600K to 4.2 GHz on the 8600K there is also an additional 5% performance boost across all workloads. All Coffee Lake processors require a 300-series chipset, making a straight CPU upgrade unfeasible despite sharing the same socket as their Z270 predecessors. Even though most games still use less than 4 cores simultaneously, the i5-8600K is a great choice for gamers (especially streamers) but for $80 less, the 8350K which is faster than last years 7600K and only marginally weaker for gaming than the 8600K is certainly well worth considering as well. [Oct '17 CPUPro]


Processor Rankings (Price vs Performance) March 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]


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

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.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.

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Intel Core i7-8700K $330Nvidia GTX 1070 $447Samsung 850 Evo 250GB $85
Intel Core i7-7700K $290Nvidia GTX 1060-6GB $335Samsung 850 Evo 500GB $150
Intel Core i5-8600K $235AMD RX 480 $400Samsung 850 Pro 256GB $121
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $170SanDisk Extreme 64GB $44
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $931SanDisk Extreme 32GB $23
Seagate Barracuda 7200.14 1TB $51Corsair Vengeance LPX DDR4 3200 C16 2x8GB $205SanDisk Extreme 16GB $18
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