IntelBX80648I75820K
IntelBX80684I78700K

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

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

Real World Speed
Performance profile from 374,546 user samples
56,793 User Benchmarks
Best Bench: 104% Base clock 3.3 GHz, turbo 4.5 GHz (avg)
Worst Bench: 65% Base clock 3.3 GHz, turbo 0.2 GHz (avg)
Poor: 65% Great: 104%
SPEED RANK: 72nd / 1159
Gaming
Gaming 83%
Aircraft carrier
Desktop
Desktop 81%
Aircraft carrier
Workstation
Workstation 73%
Battleship
317,753 User Benchmarks
Best Bench: 124% Base clock 3.7 GHz, turbo 5.45 GHz (avg)
Worst Bench: 92% Base clock 3.7 GHz, turbo 3.3 GHz (avg)
Poor: 92% Great: 124%
SPEED RANK: 22nd / 1159
Gaming
Gaming 108%
UFO
Desktop
Desktop 105%
UFO
Workstation
Workstation 95%
Nuclear submarine
Effective Speed
Effective CPU Speed
83.4 % 108 % Faster effective speed.
+30%
SC Mixed
Avg. Single Core Mixed Speed
105 Pts 138 Pts Much faster single-core speed.
+31%
QC Mixed
Avg. Quad Core Mixed Speed
408 Pts 525 Pts Faster quad-core speed.
+29%
MC Mixed
Avg. Multi Core Mixed Speed
827 Pts 1068 Pts Faster multi-core speed.
+29%
SC Mixed
OC Single Core Mixed Speed
130 Pts 155 Pts Faster OC single-core speed.
+19%
QC Mixed
OC Quad Core Mixed Speed
516 Pts 614 Pts Faster OC quad-core speed.
+19%
MC Mixed
OC Multi Core Mixed Speed
1022 Pts 1234 Pts Faster OC multi-core speed.
+21%
Market Share
Based on 17,926,493 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.33 % 2.42 % Hugely higher market share.
+633%
Value
Value For Money
74.7 % 101 % Much better value.
+35%
User Rating
UBM User Rating
69 % 166 % Hugely more popular.
+141%
Price
Price (score)
$391 $350 Slightly cheaper.
+10%
Age
Newest
58 Months 20 Months Much more recent.
+66%
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 150 Pts Faster single-core int speed.
+15%
SC Float
Single Core Floating Point Speed
131 Pts 160 Pts Faster single-core fp speed.
+22%
QC Int
Quad Core Integer Speed
517 Pts 599 Pts Faster quad-core int speed.
+16%
QC Float
Quad Core Floating Point Speed
514 Pts 636 Pts Faster quad-core fp speed.
+24%
MC Int
Multi Core Integer Speed
968 Pts 1117 Pts Faster multi-core int speed.
+15%
MC Float
Multi Core Floating Point Speed
1034 Pts 1322 Pts Faster multi-core fp speed.
+28%
Series
CPU Architecture
Haswell-E Coffee Lake
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]

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) June 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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