IntelBX80684I78700K
IntelBX80648I75820K

6 Cores, 12 Threads @3.7GHz, Coffee Lake.
Release date: Q4 2017.

6 Cores, 12 Threads @3.3GHz, Haswell-E.
Release date: Q3 2014.

Real World Speed
Performance profile from 184,996 user samples
148,352 User Benchmarks
Best Bench: 124% Base clock 3.7 GHz, turbo 5.15 GHz (avg)
Worst Bench: 92% Base clock 3.7 GHz, turbo 1.9 GHz (avg)
Poor: 92% Great: 124%
SPEED RANK: 10th / 1129
Gaming
Gaming 108%
UFO
Desktop
Desktop 105%
UFO
Workstation
Workstation 95%
Nuclear submarine
36,644 User Benchmarks
Best Bench: 103% Base clock 3.3 GHz, turbo 4.8 GHz (avg)
Worst Bench: 68% Base clock 3.3 GHz, turbo 1.2 GHz (avg)
Poor: 68% Great: 103%
SPEED RANK: 47th / 1129
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 82%
Aircraft carrier
Workstation
Workstation 75%
Battleship
Effective Speed
Effective CPU Speed
108 % Faster effective speed.
+27%
84.7 %
SC Mixed
Avg. Single Core Mixed Speed
137 Pts Faster single-core speed.
+29%
106 Pts
QC Mixed
Avg. Quad Core Mixed Speed
522 Pts Faster quad-core speed.
+26%
414 Pts
MC Mixed
Avg. Multi Core Mixed Speed
1080 Pts Faster multi-core speed.
+27%
849 Pts
SC Mixed
OC Single Core Mixed Speed
154 Pts Faster OC single-core speed.
+20%
128 Pts
QC Mixed
OC Quad Core Mixed Speed
614 Pts Faster OC quad-core speed.
+21%
507 Pts
MC Mixed
OC Multi Core Mixed Speed
1240 Pts Faster OC multi-core speed.
+21%
1021 Pts
Market Share
Based on 11,527,860 CPUs tested.
Market Share
Market Share (trailing 30 days)
3.69 % Insanely higher market share.
+1,090%
0.31 %
Value
Value For Money
98.5 % Better value.
+22%
80.8 %
User Rating
UBM User Rating
157 % Hugely more popular.
+138%
66 %
Price
Price (score)
$370 $330 Slightly cheaper.
+11%
Age
Newest
12 Months Much more recent.
+76%
50 Months
TDP
Thermal Design Power (TDP)
95 Watts Much more energy efficient.
+32%
140 Watts
Cores
CPU Processing Cores
6 cores 6 cores
Threads
CPU Processing Threads
12 threads 12 threads
Lithography
Manufacturing process
14 nm Much newer manufacturing.
+36%
22 nm
Base Clock
Base Clock Speed
3.7 GHz Slightly faster base frequency.
+12%
3.3 GHz
Turbo Clock
Turbo Clock Speed
4.7 GHz Much faster turbo frequency.
+31%
3.6 GHz
SC Int
Single Core Integer Speed
150 Pts Faster single-core int speed.
+16%
129 Pts
SC Float
Single Core Floating Point Speed
159 Pts Faster single-core fp speed.
+22%
130 Pts
QC Int
Quad Core Integer Speed
595 Pts Faster quad-core int speed.
+16%
514 Pts
QC Float
Quad Core Floating Point Speed
632 Pts Faster quad-core fp speed.
+23%
512 Pts
MC Int
Multi Core Integer Speed
1142 Pts Faster multi-core int speed.
+18%
967 Pts
MC Float
Multi Core Floating Point Speed
1315 Pts Faster multi-core fp speed.
+27%
1038 Pts
Series
CPU Architecture
Coffee Lake Haswell-E
Socket
Motherboard Socket
FCLGA1151 LGA2011-V3
Graphics
Integrated Graphics
UHD 630 None
Launch Date
Launch Date
Q4'17 Q3'14
Cache
Cache
12 MB 15 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.2, AVX 2.0, AES
Lithography
Lithography
14 nm 22 nm
Recommended Price
Recommended Customer Price
N/A $389.00 - $396.00
Bus Speed
Bus Speed
8 GT/s DMI3 0 GT/s
Memory Types
Memory Types
DDR4-2666 DDR4 1333/1600/2133
Memory Channels
Max # of Memory Channels
2 4
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 None
Package Size
Package Size
37.5mm x 37.5mm 52.5mm x 45.0mm
vPro Tech
Intel® vPro™ Technology ‡
Yes No
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
Yes No
Max # of PCI Express Lanes
Max # of PCI Express Lanes
16 28

More specs » More specs »
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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]

MORE DETAILS

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]

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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  • - CPU tests include: integer, floating and string.
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  • - RAM tests include: single/multi core bandwidth and latency.
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CPUGPUSSD
Intel Core i7-8700K $370Nvidia GTX 1070 $358Samsung 850 Evo 250GB $78
AMD Ryzen 5 1600 $155Nvidia GTX 1060-6GB $249Samsung 850 Evo 500GB $120
Intel Core i7-7700K $355AMD RX 480 $280Samsung 850 Pro 256GB $163
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $147SanDisk Extreme 64GB $42
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $869SanDisk Extreme 32GB $30
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $145SanDisk Ultra Fit 32GB $12
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