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Differences What are the advantages of each

Front view of Intel Atom E645C

Reasons to consider the
Intel Atom E645C

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Lower typical power consumption 5.69W vs 13.81W 2.4x lower typical power consumption
Lower annual home energy cost 1.69 $/year vs 4.1 $/year 2.4x lower annual home energy cost
Lower annual commercial energy cost 6.13 $/year vs 14.89 $/year 2.4x lower annual commercial energy cost
Front view of AMD A6 4455M

Reasons to consider the
AMD A6 4455M

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Much more l2 cache 2 MB vs 0.5 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly higher clock speed 2.1 GHz vs 1 GHz More than 2x higher clock speed
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much better overclocked clock speed (Air) 2.35 GHz vs 1 GHz More than 2.2x better overclocked clock speed (Air)
More cores 2 vs 1 Twice as many cores; run more applications at once
Newer May, 2012 vs Nov, 2010 Release date over 1 years later
Significantly better overclocked clock speed (Water) 2.1 GHz vs 1 GHz More than 2x better overclocked clock speed (Water)

Features Key features of the Atom E645C  vs A6 4455M 

clock speed

Atom E645C
1 GHz
A6 4455M
2.1 GHz

L2 cache

Atom E645C
0.5 MB
A6 4455M
2 MB

gpu clock speed

Atom E645C
320 MHz
A6 4455M
327 MHz

overclocked clock speed (air)

Atom E645C
1 GHz
A6 4455M
2.35 GHz

overclocked clock speed (water)

Atom E645C
1 GHz
A6 4455M
2.1 GHz

TDP

Specifications Full list of technical specs

summary

Atom E645C  vs
A6 4455M 
Clock speed 1 GHz 2.1 GHz
Cores Single core Dual core

features

Has a NX bit No Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
AVX 1.1
SSE2
F16C
MMX
XOP
AVX
SSE3
SSE
CLMUL
AMD64
SSE4.1
FMA4
FMA3
SSE4.2
CVT16
AMD-V
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 7W 17W
Annual home energy cost 1.69 $/year 4.1 $/year
Annual commercial energy cost 6.13 $/year 14.89 $/year
Typical power consumption 5.69W 13.81W

details

Atom E645C  vs
A6 4455M 
Threads 2 2
L2 cache 0.5 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 1 GHz 2.35 GHz
Overclocked clock speed (Water) 1 GHz 2.1 GHz
Overclocked clock speed (Air) 1 GHz 2.35 GHz

integrated graphics

GPU GPU GPU
Label Integrated Radeon™ HD 7500G
GPU clock speed 320 MHz 327 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR2-800
DDR2
Channels Single Channel Dual Channel
Maximum bandwidth 6,400 MB/s 21,333.32 MB/s
Intel Atom E645C
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AMD A6 4455M
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