IntelBX80648I75820K
IntelBX80684I78700K

6 Cores, 12 Threads
@3.3GHz Haswell-E (2014)

6 Cores, 12 Threads
@3.7GHz Coffee Lake (2017)

Real World Speed
Performance profile from 65,983 user samples
32,310 User Benchmarks
Best Bench: 105% Base clock 3.3 GHz, turbo 4.7 GHz (avg)
Worst Bench: 67% Base clock 3.3 GHz, turbo 1.2 GHz (avg)
Poor: 67% Great: 105%
SPEED RANK: 37th / 985
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 82%
Aircraft carrier
Workstation
Workstation 74%
Battleship
33,673 User Benchmarks
Best Bench: 126% Base clock 3.7 GHz, turbo 5 GHz (avg)
Worst Bench: 95% Base clock 3.7 GHz, turbo 1.75 GHz (avg)
Poor: 95% Great: 126%
SPEED RANK: 6th / 985
Gaming
Gaming 111%
UFO
Desktop
Desktop 108%
UFO
Workstation
Workstation 97%
Nuclear submarine
Effective Speed
Effective CPU Speed
84.9 % 111 % Much faster effective speed.
+30%
SC Mixed
Avg. Single Core Mixed Speed
106 Pts 141 Pts Much faster single-core speed.
+33%
QC Mixed
Avg. Quad Core Mixed Speed
417 Pts 539 Pts Faster quad-core speed.
+29%
MC Mixed
Avg. Multi Core Mixed Speed
841 Pts 1101 Pts Much faster multi-core speed.
+31%
SC Mixed
OC Single Core Mixed Speed
131 Pts 157 Pts Faster OC single-core speed.
+20%
QC Mixed
OC Quad Core Mixed Speed
520 Pts 620 Pts Faster OC quad-core speed.
+19%
MC Mixed
OC Multi Core Mixed Speed
1028 Pts 1262 Pts Faster OC multi-core speed.
+23%
Market Share
Based on 7,461,238 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.4 % 2.89 % Hugely higher market share.
+622%
Value
Value For Money
76.2 % 106 % Much better value.
+39%
User Rating
UBM User Rating
84 % 140 % Much more popular.
+67%
Price
Price (score)
$390 $330 Cheaper.
+15%
Age
Newest
42 Months 4 Months Hugely more recent.
+90%
TDP
Thermal Design Power (TDP)
140 Watts 95 Watts Much more energy efficient.
+32%
Cores
CPU Processing Cores
6 cores 6 cores
Threads
CPU Processing Threads
12 threads 12 threads
Lithography
Manufacturing process
22 nm 14 nm Much newer manufacturing.
+36%
Base Clock
Base Clock Speed
3.3 GHz 3.7 GHz Slightly faster base frequency.
+12%
Turbo Clock
Turbo Clock Speed
3.6 GHz 4.7 GHz Much faster turbo frequency.
+31%
SC Int
Single Core Integer Speed
130 Pts 154 Pts Faster single-core int speed.
+18%
SC Float
Single Core Floating Point Speed
130 Pts 160 Pts Faster single-core fp speed.
+23%
QC Int
Quad Core Integer Speed
517 Pts 608 Pts Faster quad-core int speed.
+18%
QC Float
Quad Core Floating Point Speed
520 Pts 636 Pts Faster quad-core fp speed.
+22%
MC Int
Multi Core Integer Speed
978 Pts 1162 Pts Faster multi-core int speed.
+19%
MC Float
Multi Core Floating Point Speed
1048 Pts 1331 Pts Faster multi-core fp speed.
+27%
Series
CPU Architecture
Haswell-E (2014) Coffee Lake (2017)
Socket
Motherboard Socket
LGA2011-V3 FCLGA1151
Graphics
Integrated Graphics
None UHD 630
Launch Date
Launch Date
Q3'14 Q4'17
Cache
Cache
15 MB SmartCache 12 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.2, AVX 2.0, AES SSE4.1/4.2, AVX2
Lithography
Lithography
22 nm 14 nm
Recommended Price
Recommended Customer Price
$389.00 - $396.00 N/A
Bus Speed
Bus Speed
0 GT/s 8 GT/s DMI3
Memory Types
Memory Types
DDR4 1333/1600/2133 DDR4-2666
Memory Channels
Max # of Memory Channels
4 2
Processor Graphics
Processor Graphics ‡
None Intel® UHD Graphics 630
Package Size
Package Size
52.5mm x 45.0mm 37.5mm x 37.5mm
vPro Tech
Intel® vPro™ Technology ‡
No Yes
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
No Yes
Max # of PCI Express Lanes
Max # of PCI Express Lanes
28 16

More specs » More specs »
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The Intel Core i7-5820K is the cheapest of three (5820K,5930K,5960X) new Haswell-E prosumer/enthusiast processors. The 5820K sports six physical cores and twelve threads which allow for enormous processing throughput. Unfortunately Intel have somewhat handicapped the 5820K by setting its base clock at just 3.3 GHz, 0.7GHz lower than the class leading 4790K. Comparing the 4790K and 5820K shows that the cheaper i7-4790K is significantly faster at both single and dual threaded workloads. The additional two cores found in the 5820K are not relevant to general computing and as such the 5820K probably makes a better server rather than consumer proposition. The Haswell-E X99 architecture also requires DDR4 RAM which is currently far more expensive than DDR3. Overall the 5820K is a very expensive option and probably best avoided by the vast majority of consumers.  [Sep '14 CPUPro]

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The i7-8700K is Intel’s latest, top of the range, 8th generation Coffee Lake processor. Like Kaby Lake and Sky Lake before that, Coffee Lake is based on Intel’s 14nm architecture which has been slightly optimized on each iteration. Following AMD’s modus operandi, Intel has upped the cores and threads across the range of their CPUs. In previous generations, a 6-core processor would have been a high-end desk-top (HEDT) processor, however the i7-8700K is the first Intel CPU with 6 cores and 12 threads to be classified (and priced) as a mainstream consumer processor. Specifically, the i7-8700K features a base clock speed of 3.7 GHz which boosts to 4.7 GHz (4.5 GHz for the previous generation i7-7700k), 12MB of smart (L3) cache and 2 channels of DDR4 RAM. The majority of the performance improvements over the 7th generation stem from the higher core count which results in a 50% increase in multi-core speed between the i7-7700k and i7-8700k. A new motherboard will need to be factored into the budget when upgrading to the 8700K as it requires a new Intel Z370 chipset which has supposedly been designed to better deliver power to CPUs with a greater number of cores. Also available in this latest release of CPUs is the 6 core 6 thread i5-8600k which is a more rational option (around $100 cheaper) for the vast majority of users that don’t require hyper-threading. Sandy bridge owners can finally justify an upgrade but with the next iteration of AMD's Zen architecture just around the corner the CPU market will be a lot faster moving now that Intel, once again, has to compete. [Sep '17 CPUPro]

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Processor Rankings (Price vs Performance) February 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.
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.

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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 userbenchmark.com.
  • - 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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CPUGPUSSD
Intel Core i7-8700K $330Nvidia GTX 1070 $430Samsung 850 Evo 250GB $88
Intel Core i7-7700K $290Nvidia GTX 1060-6GB $285Samsung 850 Evo 500GB $149
AMD Ryzen 5 1600 $170AMD RX 480 $400Samsung 850 Pro 256GB $125
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $185SanDisk Extreme 64GB $50
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $975SanDisk Extreme 32GB $23
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $206SanDisk Extreme 16GB $18
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