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Differences What are the advantages of each

Front view of Intel Core i7 6820HQ

Reasons to consider the
Intel Core i7 6820HQ

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Much better 3DMark06 CPU score 67.6 vs 61.1 More than 10% better 3DMark06 CPU score
Better turbo clock speed 1,050 MHz vs 950 MHz More than 10% better turbo clock speed
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 CompuBench 1.5 video composition score 17.26 fps vs 10.57 fps Around 65% better CompuBench 1.5 video composition score
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 PassMark score 8,793 vs 6,687 More than 30% better PassMark score
Better overclocked clock speed (Air) 3.54 GHz vs 3.19 GHz More than 10% better overclocked clock speed (Air)
Front view of Intel Core i5 6440HQ

Reasons to consider the
Intel Core i5 6440HQ

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Significantly better performance per dollar 0.92 pt/$ vs 0.53 pt/$ Around 75% better performance per dollar
Slightly better performance per watt 5.11 pt/W vs 4.46 pt/W Around 15% better performance per watt

Benchmarks Real world tests of Core i7 6820HQ vs i5 6440HQ

CompuBench 1.5 (Bitcoin mining) Data courtesy CompuBench

Core i7 6820HQ
30.97 mHash/s
Core i5 6440HQ
23.73 mHash/s

CompuBench 1.5 (Face detection)

Core i7 6820HQ
25.95 mPixels/s
Core i5 6440HQ
16.57 mPixels/s

CompuBench 1.5 (Ocean surface simulation) Data courtesy CompuBench

Core i7 6820HQ
260.72 fps
Core i5 6440HQ
177.33 fps

CompuBench 1.5 (T-Rex) Data courtesy CompuBench

Core i5 6440HQ
1.29 fps

CompuBench 1.5 (Video composition) Data courtesy CompuBench

Core i7 6820HQ
17.26 fps
Core i5 6440HQ
10.57 fps

3D Mark 06 (CPU)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 6820HQ  vs
i5 6440HQ 
Clock speed 2.7 GHz 2.6 GHz
Turbo clock speed 3.6 GHz 3.5 GHz
Cores Quad core Quad core
Is unlocked No No

features

Has a NX bit Yes Yes
Supports trusted computing Yes 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 45W 45W
Annual home energy cost 10.84 $/year 10.84 $/year
Annual commercial energy cost 39.42 $/year 39.42 $/year
Performance per watt 4.46 pt/W 5.11 pt/W
Typical power consumption 36.56W 36.56W

bus

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

details

Core i7 6820HQ  vs
i5 6440HQ 
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 14 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.54 GHz 3.19 GHz
Overclocked clock speed (Water) 2.7 GHz 2.6 GHz
Overclocked clock speed (Air) 3.54 GHz 3.19 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 530 Intel® HD Graphics 530
Number of displays supported 3 3
GPU clock speed 350 MHz 350 MHz
Turbo clock speed 1,050 MHz 950 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 25,600 MB/s 25,600 MB/s
Maximum memory size 65,536 MB 65,536 MB
Intel Core i7 6820HQ
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Intel Core i5 6440HQ
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