IntelBX80673I97900X
IntelBX80684I78700K

10 Cores, 20 Threads @3.8GHz, Skylake-X.
Release date: Q2 2017.

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

Real World Speed
Performance profile from 645,066 user samples
14,853 User Benchmarks
Best Bench: 92% Base clock 3.3 GHz, turbo 4.75 GHz (avg)
Worst Bench: 74% Base clock 3.3 GHz, turbo 1.5 GHz (avg)
Poor: 74% Great: 92%
SPEED RANK: 120th / 1316
Gaming
Gaming 83%
Aircraft carrier
Desktop
Desktop 83%
Aircraft carrier
Workstation
Workstation 89%
Aircraft carrier
630,213 User Benchmarks
Best Bench: 103% Base clock 2.6 GHz
Worst Bench: 81% Base clock 3.7 GHz, turbo 4.3 GHz (avg)
Poor: 81% Great: 103%
SPEED RANK: 49th / 1316
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 94%
Nuclear submarine
Workstation
Workstation 84%
Aircraft carrier
Effective Speed
Effective CPU Speed
82.7 % 92.5 % Faster effective speed.
+12%
14 Nov19|PCGamer
AMD Ryzen 9 3950X review
11 % Hitm2 4%, FarC5 33%, StrangeB 2%, TWarW2 29%, SotTR 5%, ACO 2%, MetroEx 8%, MESoW 14%, Divis2 1%
10 Mar21|HardwareLUXX
Processor non grata: Rocket Lake-S...
12 % BFV 13%, SotTR 3%, MetroEx 30%, Divis2 3%
Memory
Avg. Memory Latency
75.4 Pts 91.9 Pts Lower memory latency.
+22%
1-Core
Avg. Single Core Mixed Speed
125 Pts 134 Pts Slightly faster single-core speed.
+7%
2-Core
Avg. Dual Core Mixed Speed
246 Pts 262 Pts Slightly faster dual-core speed.
+7%
4-Core
Avg. Quad Core Mixed Speed
482 Pts 501 Pts +4%
8-Core
Avg. Octa Core Mixed Speed
929 Pts Faster octa-core speed.
+15%
811 Pts
Memory
OC Memory Latency
84.2 Pts 97.1 Pts Lower OC memory latency.
+15%
1-Core
OC Single Core Mixed Speed
140 Pts 152 Pts Slightly faster OC single-core speed.
+9%
2-Core
OC Dual Core Mixed Speed
274 Pts 301 Pts Slightly faster OC dual-core speed.
+10%
4-Core
OC Quad Core Mixed Speed
550 Pts 591 Pts Slightly faster OC quad-core speed.
+7%
8-Core
OC Octa Core Mixed Speed
1086 Pts Faster OC octa-core speed.
+15%
945 Pts
Market Share
Based on 46,465,457 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.04 % 1.22 % Insanely higher market share.
+2,950%
Value
Value For Money
64.2 % 89 % Much better value.
+39%
User Rating
UBM User Rating
54 % 80 % Much more popular.
+48%
Price
Price (score)
$699 $320 Much cheaper.
+54%
Age
Newest
50 Months 47 Months Slightly more recent.
+6%
TDP
Thermal Design Power (TDP)
140 Watts 95 Watts Much more energy efficient.
+32%
Cores
CPU Processing Cores
10 cores Much higher core count.
+67%
6 cores
Threads
CPU Processing Threads
20 threads Much higher thread count.
+67%
12 threads
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.8 GHz +3% 3.7 GHz
Turbo Clock
Turbo Clock Speed
4.3 GHz 4.7 GHz Slightly faster turbo frequency.
+9%
64-Core
OC Multi Core Mixed Speed
1802 Pts Much faster OC 64-core speed.
+55%
1165 Pts
64-Core
Avg. Multi Core Mixed Speed
1563 Pts Much faster 64-core speed.
+55%
1009 Pts
Series
CPU Architecture
Skylake-X Coffee Lake
Socket
Motherboard Socket
LGA2066 FCLGA1151
Graphics
Integrated Graphics
None UHD 630
Launch Date
Launch Date
Q2'17 Q4'17
Cache
Cache
13.75 MB L3 12 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2, AVX-512 SSE4.1/4.2, AVX2
Recommended Price
Recommended Customer Price
$989.00 - $999.00 N/A
Max Turbo Frequency
Max Turbo Frequency
4.30 GHz 4.70 GHz
Thermal Solution Specification
Thermal Solution Specification
PCG 2017X PCG 2015C (130W)
Max Memory Size
Max Memory Size (dependent on memory type)
128 GB 64 GB
Memory Channels
Max # of Memory Channels
4 2
Max # of PCI Express Lanes
Max # of PCI Express Lanes
44 16

More specs » More specs »
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Intel’s core i9-7900X, from the Skylake-X series, is Intel’s latest 10-core, 20-thread flagship processor. It's the first to bear the i9 moniker and utilize the new X299 (Basin Falls) chipset/motherboard. The 7900X is the fastest CPU on the market today, however, imminent competition from AMD’s 16-core, 32-thread Ryzen Threadripper CPUs and the forthcoming release of more Intel Core X series mean that its reign will be a short one. The i9-7900X supersedes the 10-core Broadwell-E core i7-6950X that held the crown for little over a year. Both are extremely powerful and pricey high end desktop processors (HEDTs) which excel in multi-threaded tasks such as media encoding. However, despite the same power draw (TDP 140W), the newer i9-7900X betters the i7-6950X in terms of peak overclocked performance by 10% mostly thanks to increased clock speeds from 3.0GHz/4.0GHz to 3.3GHz/4.3GHz for base/turbo. It also betters the i7-6950X on price by around 28%. This all translates to the i9-7900X offering around 20% more value for money, even despite its eye-watering $999 price tag. The more accessible pricing (albeit not accessible for the majority) and hurried release of the i9-7900k to market is widely perceived as a reaction to AMD’s Ryzen Threadripper CPUs, rumoured for release towards the end of July 2017. So if you want to own the fastest consumer CPU in the world, it would be wise to wait for the dust to settle. [Jul '17 CPUPro]

MORE DETAILS

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

Processor Rankings (Price vs Performance) September 2021 CPU Rankings.

We calculate effective speed which measures real world performance for typical users. Effective speed is adjusted by current prices to yield a value for money rating. 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.
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.
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - SkillBench (space shooter) tests user input accuracy.
  • - 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 current market leaders.
  • - Explore your best upgrade options with a virtual PC build.
  • - Compare your in-game FPS to other users with your hardware.

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