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Differences What are the advantages of each

Front view of Intel Xeon E5-2620

Reasons to consider the
Intel Xeon E5-2620

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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 GHz vs 1 GHz 2x higher clock speed
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
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
More cores 6 vs 1 5 more cores; run more applications at once
More threads 12 vs 2 10 more threads
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Significantly better overclocked clock speed (Air) 2.28 GHz vs 1 GHz More than 2.2x better overclocked clock speed (Air)
Supports more RAM 393,216 MB vs 3,000.32 MB Supports more than 131x more RAM
Newer Mar, 2012 vs Nov, 2010 Release date over 1 years later
Significantly better overclocked clock speed (Water) 2 GHz vs 1 GHz 2x better overclocked clock speed (Water)
Front view of Intel Atom E645C

Reasons to consider the
Intel Atom E645C

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Much lower typical power consumption 5.69W vs 77.19W 13.6x lower typical power consumption
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower annual home energy cost 1.69 $/year vs 22.89 $/year 13.6x lower annual home energy cost
Much lower annual commercial energy cost 6.13 $/year vs 83.22 $/year 13.6x lower annual commercial energy cost
More l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core

Features Key features of the Xeon E5-2620  vs Atom E645C 

clock speed

Xeon E5-2620
2 GHz
Atom E645C
1 GHz

L2 cache

Atom E645C
0.5 MB

overclocked clock speed (air)

Xeon E5-2620
2.28 GHz
Atom E645C
1 GHz

overclocked clock speed (water)

Xeon E5-2620
2 GHz
Atom E645C
1 GHz

Specifications Full list of technical specs

summary

Xeon E5-2620  vs
Atom E645C 
Clock speed 2 GHz 1 GHz
Cores Hexa core Single core

features

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

power consumption

TDP 95W 7W
Annual home energy cost 22.89 $/year 1.69 $/year
Annual commercial energy cost 83.22 $/year 6.13 $/year
Typical power consumption 77.19W 5.69W

bus

Architecture QPI FSB
Number of links 2 1
Transfer rate 7,200 MT/s 2,500 MT/s

details

Xeon E5-2620  vs
Atom E645C 
Architecture x86-64 x86
Threads 12 2
L2 cache 2 MB 0.5 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 2.28 GHz 1 GHz
Overclocked clock speed (Water) 2 GHz 1 GHz
Overclocked clock speed (Air) 2.28 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
DDR3-1333
DDR3-1066
DDR3
DDR3-800
DDR2-800
DDR2
Channels Quad Channel Single Channel
Supports ECC Yes No
Maximum bandwidth 42,666.64 MB/s 6,400 MB/s
Maximum memory size 393,216 MB 3,000.32 MB
Intel Xeon E5-2620
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Intel Atom E645C
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