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Differences What are the advantages of each

Front view of Intel E3940

Reasons to consider the
Intel E3940

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Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed
Significantly newer manufacturing process 14 nm vs 22 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 1.6 GHz vs 1.33 GHz More than 20% higher clock speed
Significantly better geekbench 3 Multi-Core score 3,564 vs 1,018 More than 3.5x better geekbench 3 Multi-Core score
More number of displays supported 3 vs 2 1 more number of displays supported
More cores 4 vs 2 Twice as many cores; run more applications at once
Better geekbench 3 single core score 1,086 vs 586 More than 85% better geekbench 3 single core score
Better performance per watt 6.52 pt/W vs 4.24 pt/W Around 55% better performance per watt
Newer Oct, 2016 vs Oct, 2013 Release date over 3 years later
More threads 4 vs 2 Twice as many threads
Front view of Intel Atom E3825

Reasons to consider the
Intel Atom E3825

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Higher GPU clock speed 533 MHz vs 400 MHz Around 35% higher GPU clock speed
Higher Maximum operating temperature 110 °C vs 100 °C 10% higher Maximum operating temperature

Benchmarks Real world tests of E3940 vs Atom E3825

GeekBench 3 (Multi-core) Data courtesy Primate Labs

E3940
3,564
Atom E3825
1,018

GeekBench 3 (Single core) Data courtesy Primate Labs

E3940
1,086

GeekBench 3 (AES single core) Data courtesy Primate Labs

E3940
868.7 MB/s
Atom E3825
197.9 MB/s

Specifications Full list of technical specs

summary

E3940  vs
Atom E3825 
Clock speed 1.6 GHz 1.33 GHz
Cores Quad core Dual core

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
AES
EM64T
Supports dynamic frequency scaling Yes No

memory controller

Memory controller Built-in Built-in
Memory type
DDR3
DDR3L-1066
Channels Quad Channel Single Channel
Supports ECC Yes Yes
Maximum bandwidth 25,600 MB/s 6,400 MB/s
Maximum memory size 8,192 MB 8,192 MB

details

E3940  vs
Atom E3825 
Architecture x86-64 x86-64
Threads 4 2
Manufacture process 14 nm 22 nm
Max CPUs 1 1
Operating temperature Unknown - 100°C -40 - 110°C

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 500 HD
Number of displays supported 3 2
GPU clock speed 400 MHz 533 MHz

power consumption

TDP 9.5W 6W
Annual home energy cost 2.29 $/year 1.45 $/year
Annual commercial energy cost 8.32 $/year 5.26 $/year
Performance per watt 6.52 pt/W 4.24 pt/W
Typical power consumption 7.72W 4.88W

bus

Architecture FSB FSB
Number of links 1 1
Intel E3940
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Intel Atom E3825
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