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Differences What are the advantages of each

Front view of Intel Xeon E3-1220LV2

Reasons to consider the
Intel Xeon E3-1220LV2

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Much higher clock speed 2.3 GHz vs 1 GHz More than 2.2x 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
More l2 cache 1 MB vs 0.5 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Better overclocked clock speed (Air) 1.8 GHz vs 1 GHz 80% better overclocked clock speed (Air)
More cores 2 vs 1 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Newer May, 2012 vs Nov, 2010 Release date over 1 years later
Better overclocked clock speed (Water) 1.8 GHz vs 1 GHz 80% better overclocked clock speed (Water)
Front view of Intel Atom E645CT

Reasons to consider the
Intel Atom E645CT

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
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

Features Key features of the Xeon E3-1220LV2  vs Atom E645CT 

clock speed

L2 cache

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Xeon E3-1220LV2  vs
Atom E645CT 
Clock speed 2.3 GHz 1 GHz
Cores Dual core Single core

features

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

power consumption

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

bus

Architecture DMI FSB
Number of links 1 1
Transfer rate 5,000 MT/s 2,500 MT/s

details

Xeon E3-1220LV2  vs
Atom E645CT 
Architecture x86-64 x86
Threads 4 2
L2 cache 1 MB 0.5 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 22 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 1.8 GHz 1 GHz
Overclocked clock speed (Water) 1.8 GHz 1 GHz
Overclocked clock speed (Air) 1.8 GHz 1 GHz

integrated graphics

GPU None GPU
Label N/A Integrated
GPU clock speed N/A 320 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR2-800
DDR2
Channels Dual Channel Single Channel
Supports ECC Yes No
Maximum bandwidth 25,600 MB/s 6,400 MB/s
Maximum memory size 33,003.52 MB 3,000.32 MB
Intel Xeon E3-1220LV2
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Intel Atom E645CT
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