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Differences What are the advantages of each

Front view of Intel Atom E620

Reasons to consider the
Intel Atom E620

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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
Front view of Intel Atom E3815

Reasons to consider the
Intel Atom E3815

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Significantly higher clock speed 1.46 GHz vs 0.6 GHz Around 2.5x higher clock speed
Much newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
Significantly better overclocked clock speed (Air) 1.47 GHz vs 0.6 GHz Around 2.5x better overclocked clock speed (Air)
Higher GPU clock speed 400 MHz vs 320 MHz 25% higher GPU clock speed
Newer Oct, 2013 vs Sep, 2010 Release date over 3 years later
Significantly better overclocked clock speed (Water) 1.47 GHz vs 0.6 GHz Around 2.5x better overclocked clock speed (Water)

Features Key features of the Atom E620  vs E3815 

clock speed

Atom E620
0.6 GHz
Atom E3815
1.46 GHz

L2 cache

Atom E620
0.5 MB
Atom E3815
0.5 MB

gpu clock speed

Atom E620
320 MHz
Atom E3815
400 MHz

overclocked clock speed (air)

Atom E620
0.6 GHz
Atom E3815
1.47 GHz

overclocked clock speed (water)

Atom E620
0.6 GHz
Atom E3815
1.47 GHz

TDP

Specifications Full list of technical specs

summary

Atom E620  vs
E3815 
Clock speed 0.6 GHz 1.46 GHz
Cores Single core Single core

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
EM64T
SSE
Supplemental SSE3
Supports dynamic frequency scaling Yes No

power consumption

TDP 3.3W 5W
Annual home energy cost 0.79 $/year 1.2 $/year
Annual commercial energy cost 2.89 $/year 4.38 $/year
Typical power consumption 2.68W 4.06W

bus

Architecture FSB FSB
Number of links 1 1

details

Atom E620  vs
E3815 
Architecture x86 x86-64
Threads 2 1
L2 cache 0.5 MB 0.5 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 45 nm 22 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 0.6 GHz 1.47 GHz
Overclocked clock speed (Water) 0.6 GHz 1.47 GHz
Overclocked clock speed (Air) 0.6 GHz 1.47 GHz

integrated graphics

GPU GPU GPU
Label Integrated HD
GPU clock speed 320 MHz 400 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR2-800
DDR3L-1066
DDR2
Channels Single Channel Single Channel
Supports ECC No Yes
Maximum bandwidth 6,400 MB/s 6,400 MB/s
Maximum memory size 2,048 MB 8,192 MB
Intel Atom E620
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Intel Atom E3815
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