CPUBoss Review Our evaluation of 6700K vs 2500K among all CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Sky Diver and Cloud Gate

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

8.2

CPUBoss Score

Combination of all six facets

Winner
Intel Core i7 6700K 

CPUBoss recommends the Intel Core i7 6700K  based on its performance and single-core performance.

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VS

Differences What are the advantages of each

Front view of Intel Core i7 6700K

Reasons to consider the
Intel Core i7 6700K

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Higher clock speed 4 GHz vs 3.3 GHz More than 20% higher clock speed
Much newer manufacturing process 14 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher turbo clock speed 4.2 GHz vs 3.7 GHz Around 15% higher turbo clock speed
Much lower typical power consumption 73.94W vs 112.55W Around 35% lower typical power consumption
Significantly better PassMark score 11,109 vs 6,383 Around 75% better PassMark score
More number of displays supported 3 vs 2 1 more number of displays supported
Slightly more l3 cache 8 MB vs 6 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
Better PassMark (Single core) score 2,349 vs 1,863 More than 25% better PassMark (Single core) score
Newer Jul, 2015 vs Jan, 2011 Release date over 4 years later
More threads 8 vs 4 Twice as many threads
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Better turbo clock speed 1,150 MHz vs 1,100 MHz Around 5% better turbo clock speed
Much lower annual home energy cost 21.92 $/year vs 41.29 $/year More than 45% lower annual home energy cost
Significantly lower annual commercial energy cost 79.72 $/year vs 110.03 $/year Around 30% lower annual commercial energy cost
Front view of Intel Core i5 2500K

Reasons to consider the
Intel Core i5 2500K

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Much better performance per dollar 4.1 pt/$ vs 0.91 pt/$ More than 4.5x better performance per dollar
Much higher GPU clock speed 850 MHz vs 350 MHz Around 2.5x higher GPU clock speed
Significantly better performance per watt 6.79 pt/W vs 3.49 pt/W Around 95% better performance per watt
Higher Maximum operating temperature 72.6 °C vs 64 °C Around 15% higher Maximum operating temperature
Better overclocked clock speed (Air) 4.98 GHz vs 4.61 GHz Around 10% better overclocked clock speed (Air)

Benchmarks Real world tests of Core i7 6700K vs i5 2500K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 6700K
6,010 MB/s
Core i5 2500K
2,530,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

Cinebench R10 32-Bit

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 6700K  vs
i5 2500K 
Clock speed 4 GHz 3.3 GHz
Turbo clock speed 4.2 GHz 3.7 GHz
Cores Quad core Quad core
Is unlocked Yes Yes

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 91W 95W
Annual home energy cost 21.92 $/year 41.29 $/year
Annual commercial energy cost 79.72 $/year 110.03 $/year
Performance per watt 3.49 pt/W 6.79 pt/W
Typical power consumption 73.94W 112.55W

bus

Architecture FSB DMI
Number of links 0 1
Transfer rate 8,000 MT/s 5,000 MT/s

details

Core i7 6700K  vs
i5 2500K 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 14 nm 32 nm
Max CPUs 1 1
Operating temperature Unknown - 64°C 5 - 72.6°C

overclocking

Overclocked clock speed 4.61 GHz 4.98 GHz
Overclocked clock speed (Water) 4.77 GHz 4.88 GHz
Overclocked clock speed (Air) 4.61 GHz 4.98 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 530 Intel® HD Graphics 3000
Number of displays supported 3 2
GPU clock speed 350 MHz 850 MHz
Turbo clock speed 1,150 MHz 1,100 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 25,600 MB/s 21,333.32 MB/s
Maximum memory size 65,536 MB 32,768 MB
Intel Core i7 6700K
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Intel Core i5 2500K
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