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Intel Core i7 6700K

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Front view of Intel Core i7 6700K

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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Much better 3DMark06 CPU score 80.5 vs 67.9 Around 20% better 3DMark06 CPU score
Significantly higher clock speed 4 GHz vs 3 GHz Around 35% higher clock speed
Significantly newer manufacturing process 14 nm vs 22 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher turbo clock speed 4.2 GHz vs 3.9 GHz Around 10% higher turbo clock speed
Better PassMark (Single core) score 2,349 vs 2,054 Around 15% better PassMark (Single core) score
Better performance per dollar 0.91 pt/$ vs 0.72 pt/$ More than 25% better performance per dollar
Newer Jul, 2015 vs Sep, 2012 Release date over 2 years later
Better PassMark score 11,109 vs 9,820 Around 15% better PassMark score
Much better overclocked clock speed (Water) 4.77 GHz vs 3 GHz Around 60% better overclocked clock speed (Water)
Front view of Intel Core i7 3940XM

Reasons to consider the
Intel Core i7 3940XM

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Much better performance per watt 14.42 pt/W vs 3.49 pt/W Around 4.2x better performance per watt
Much higher GPU clock speed 650 MHz vs 350 MHz More than 85% higher GPU clock speed
Significantly lower typical power consumption 44.69W vs 73.94W Around 40% lower typical power consumption
Significantly better turbo clock speed 1,350 MHz vs 1,150 MHz More than 15% better turbo clock speed
Much higher Maximum operating temperature 105 °C vs 64 °C Around 65% higher Maximum operating temperature
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Significantly lower annual home energy cost 13.25 $/year vs 21.92 $/year Around 40% lower annual home energy cost
Significantly lower annual commercial energy cost 48.18 $/year vs 79.72 $/year Around 40% lower annual commercial energy cost

Benchmarks Real world tests of Core i7 6700K vs 3940XM

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 i7 3940XM
2,680,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

3D Mark 06 (CPU)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 6700K  vs
3940XM 
Clock speed 4 GHz 3 GHz
Turbo clock speed 4.2 GHz 3.9 GHz
Cores Quad core Quad core
Is unlocked Yes Yes

features

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

power consumption

TDP 91W 55W
Annual home energy cost 21.92 $/year 13.25 $/year
Annual commercial energy cost 79.72 $/year 48.18 $/year
Performance per watt 3.49 pt/W 14.42 pt/W
Typical power consumption 73.94W 44.69W

bus

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

details

Core i7 6700K  vs
3940XM 
Architecture x86-64 x86-64
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 14 nm 22 nm
Max CPUs 1 1
Operating temperature Unknown - 64°C Unknown - 105°C

overclocking

Overclocked clock speed 4.61 GHz 4.45 GHz
Overclocked clock speed (Water) 4.77 GHz 3 GHz
Overclocked clock speed (Air) 4.61 GHz 4.45 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 530 Intel® HD Graphics 4000
Number of displays supported 3 3
GPU clock speed 350 MHz 650 MHz
Turbo clock speed 1,150 MHz 1,350 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
DDR3
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 25,600 MB/s 12,800 MB/s
Maximum memory size 65,536 MB 32,768 MB
Intel Core i7 6700K
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Intel Core i7 3940XM
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