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Differences What are the advantages of each

Front view of Intel Xeon E5-1620

Reasons to consider the
Intel Xeon E5-1620

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Much higher clock speed 3.6 GHz vs 0.9 GHz 4x 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
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
Much better overclocked clock speed (Air) 3.93 GHz vs 0.9 GHz More than 4.2x better overclocked clock speed (Air)
More cores 4 vs 1 3 more cores; run more applications at once
More threads 8 vs 2 6 more threads
Much better overclocked clock speed (Water) 4.7 GHz vs 0.9 GHz Around 5.2x better overclocked clock speed (Water)
Newer Mar, 2012 vs May, 2010 Release date over 1 years later
Front view of Intel Atom Z620

Reasons to consider the
Intel Atom Z620

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Much lower typical power consumption 2.44W vs 105.63W 43.3x lower typical power consumption
Much lower annual home energy cost 0.72 $/year vs 31.32 $/year 43.3x lower annual home energy cost
Much lower annual commercial energy cost 2.63 $/year vs 113.88 $/year 43.3x lower annual commercial energy cost
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core

Features Key features of the Xeon E5-1620  vs Atom Z620 

clock speed

Xeon E5-1620
3.6 GHz
Atom Z620
0.9 GHz

L2 cache

Atom Z620
0.5 MB

overclocked clock speed (air)

Xeon E5-1620
3.93 GHz
Atom Z620
0.9 GHz

overclocked clock speed (water)

Xeon E5-1620
4.7 GHz
Atom Z620
0.9 GHz

TDP

Specifications Full list of technical specs

summary

Xeon E5-1620  vs
Atom Z620 
Clock speed 3.6 GHz 0.9 GHz
Cores Quad core Single core

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

details

Xeon E5-1620  vs
Atom Z620 
Threads 8 2
L2 cache 1 MB 0.5 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.93 GHz 0.9 GHz
Overclocked clock speed (Water) 4.7 GHz 0.9 GHz
Overclocked clock speed (Air) 3.93 GHz 0.9 GHz

power consumption

TDP 130W 3W
Annual home energy cost 31.32 $/year 0.72 $/year
Annual commercial energy cost 113.88 $/year 2.63 $/year
Typical power consumption 105.63W 2.44W
Intel Xeon E5-1620
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Intel Atom Z620
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