IntelBX80684I78700K
IntelBX80673I77820X

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

8 Cores, 16 Threads @3.6GHz, Skylake-X.
Release date: Q2 2017.

Real World Speed
Performance profile from 297,322 user samples
284,422 User Benchmarks
Best Bench: 123% Base clock 3.7 GHz, turbo 5.15 GHz (avg)
Worst Bench: 90% Base clock 3.7 GHz, turbo 4.3 GHz (avg)
Poor: 90% Great: 123%
SPEED RANK: 23rd / 1158
Gaming
Gaming 107%
UFO
Desktop
Desktop 105%
UFO
Workstation
Workstation 94%
Nuclear submarine
12,900 User Benchmarks
Best Bench: 123% Base clock 3.6 GHz, turbo 4.15 GHz (avg)
Worst Bench: 90% Base clock 3.6 GHz, turbo 1.65 GHz (avg)
Poor: 90% Great: 123%
SPEED RANK: 24th / 1158
Gaming
Gaming 107%
UFO
Desktop
Desktop 103%
UFO
Workstation
Workstation 110%
UFO
Effective Speed
Effective CPU Speed
107 % +1% 107 %
SC Mixed
Avg. Single Core Mixed Speed
137 Pts Slightly faster single-core speed.
+6%
129 Pts
QC Mixed
Avg. Quad Core Mixed Speed
522 Pts +4% 501 Pts
MC Mixed
Avg. Multi Core Mixed Speed
1060 Pts 1333 Pts Faster multi-core speed.
+26%
SC Mixed
OC Single Core Mixed Speed
155 Pts +5% 148 Pts
QC Mixed
OC Quad Core Mixed Speed
613 Pts +4% 588 Pts
MC Mixed
OC Multi Core Mixed Speed
1223 Pts 1566 Pts Faster OC multi-core speed.
+28%
Market Share
Based on 17,143,379 CPUs tested.
Market Share
Market Share (trailing 30 days)
2.49 % Insanely higher market share.
+1,975%
0.12 %
Value
Value For Money
99.8 % Slightly better value.
+13%
88.7 %
User Rating
UBM User Rating
167 % Hugely more popular.
+165%
63 %
Price
Price (score)
$355 Cheaper.
+25%
$476
Age
Newest
19 Months Slightly more recent.
+14%
22 Months
TDP
Thermal Design Power (TDP)
95 Watts Much more energy efficient.
+32%
140 Watts
Cores
CPU Processing Cores
6 cores 8 cores Much higher core count.
+33%
Threads
CPU Processing Threads
12 threads 16 threads Much higher thread count.
+33%
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.7 GHz +3% 3.6 GHz
Turbo Clock
Turbo Clock Speed
4.7 GHz +4% 4.5 GHz
SC Int
Single Core Integer Speed
150 Pts +4% 144 Pts
SC Float
Single Core Floating Point Speed
159 Pts +4% 153 Pts
QC Int
Quad Core Integer Speed
595 Pts +4% 574 Pts
QC Float
Quad Core Floating Point Speed
633 Pts Slightly faster quad-core fp speed.
+6%
600 Pts
MC Int
Multi Core Integer Speed
1110 Pts 1432 Pts Faster multi-core int speed.
+29%
MC Float
Multi Core Floating Point Speed
1313 Pts 1660 Pts Faster multi-core fp speed.
+26%
Series
CPU Architecture
Coffee Lake Skylake-X
Socket
Motherboard Socket
FCLGA1151 LGA2066
Graphics
Integrated Graphics
UHD 630 None
Launch Date
Launch Date
Q4'17 Q2'17
Cache
Cache
12 MB 11 MB L3
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX 2.0, AVX-512
Recommended Price
Recommended Customer Price
N/A $589.00 - $599.00
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (130W) PCG 2017X
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 128 GB
Memory Channels
Max # of Memory Channels
2 4
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]

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The I7-7820X is the second of three new Skylake-X HEDT (high end desktop processors) released by Intel as part of their core X series (the others being the flagship 10-core i9-7900X and the 6-core i7-7800X). The 7820X is an 8-core, 16-thread CPU which will amply satisfy all but the heaviest of multi-threaded use cases. The 7820X requires a relatively expensive X299 (Basin Falls) motherboard, which costs upwards of $250. The 7820X is listed at $599 which is about $200 more than AMD's current flagship 8-core, 16 thread Ryzen 7 1800X. In addition to better IPC, the 7820X is higher clocked with base and max boost clocks of 3.6/4.5 GHz respectively, compared to 3.6G/4.0 GHz for the Ryzen 7 1800X. The additional $200 (50%) buys you around 20% more performance in both single and multi core workloads. Intel have also released several Kabylake-X HEDT CPUs: the 4-thread i5-7640X and the 8-thread i7-7740X and will shortly release of even higher spec Skylake-X processors. It's probably wise to hold off purchasing until the eagerly anticipated 16-core, 32-thread Ryzen Threadripper CPUs are launched later this month. [Jul '17 CPUPro]

MORE DETAILS

Processor Rankings (Price vs Performance) May 2019 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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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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CPUGPUSSD
Intel Core i7-8700K $355Nvidia GTX 1070 $380Samsung 850 Evo 250GB $92
AMD Ryzen 5 2600 $139Nvidia GTX 1060-6GB $208Samsung 850 Evo 500GB $99
AMD Ryzen 5 1600 $108Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $163
HDDRAMUSB
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $90SanDisk Extreme 64GB $128
WD Blue 1TB (2012) $40G.SKILL Trident Z DDR4 3200 C14 4x16GB $601SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $77Corsair Vengeance LPX DDR4 3200 C16 2x8GB $95SanDisk Ultra Fit 32GB $12
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