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Differences What are the advantages of each

Front view of Intel Xeon E7520

Reasons to consider the
Intel Xeon E7520

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Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
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
More threads 8 vs 4 Twice as many threads
Front view of Intel Atom E3845

Reasons to consider the
Intel Atom E3845

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Much newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower typical power consumption 8.13W vs 77.19W 9.5x lower typical power consumption
Much higher Maximum operating temperature 110 °C vs 70 °C More than 55% higher Maximum operating temperature
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Newer Oct, 2013 vs Mar, 2010 Release date over 3 years later
Much lower annual home energy cost 2.41 $/year vs 22.89 $/year 9.5x lower annual home energy cost
Much lower annual commercial energy cost 8.76 $/year vs 83.22 $/year 9.5x lower annual commercial energy cost

Features Key features of the Xeon E7520  vs Atom E3845 

clock speed

Xeon E7520
1.87 GHz
Atom E3845
1.91 GHz

L2 cache

overclocked clock speed (air)

Xeon E7520
1.87 GHz
Atom E3845
1.92 GHz

overclocked clock speed (water)

Xeon E7520
1.87 GHz
Atom E3845
1.91 GHz

TDP

Specifications Full list of technical specs

summary

Xeon E7520  vs
Atom E3845 
Clock speed 1.87 GHz 1.91 GHz
Cores Quad core Quad core
Socket type
LGA 1567
BGA 1170

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
EM64T
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes No

power consumption

TDP 95W 10W
Annual home energy cost 22.89 $/year 2.41 $/year
Annual commercial energy cost 83.22 $/year 8.76 $/year
Typical power consumption 77.19W 8.13W

details

Xeon E7520  vs
Atom E3845 
Threads 8 4
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 45 nm 22 nm
Max CPUs 4 1
Operating temperature Unknown - 70°C -40 - 110°C

overclocking

Overclocked clock speed 1.87 GHz 1.92 GHz
Overclocked clock speed (Water) 1.87 GHz 1.91 GHz
Overclocked clock speed (Air) 1.87 GHz 1.92 GHz

integrated graphics

GPU None GPU
Label N/A HD
Number of displays supported N/A 2
GPU clock speed N/A 542 MHz
Turbo clock speed N/A 792 MHz

bus

Architecture QPI FSB
Number of links 4 1
Intel Xeon E7520
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Intel Atom E3845
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