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Differences What are the advantages of each

Front view of Intel Core i7 3820

Reasons to consider the
Intel Core i7 3820

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Much higher clock speed 3.6 GHz vs 0.6 GHz 6x 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
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) 4.68 GHz vs 0.6 GHz More than 7.8x 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) 4.71 GHz vs 0.6 GHz More than 7.8x better overclocked clock speed (Water)
Newer Feb, 2012 vs Sep, 2010 Release date over 1 years later
Front view of Intel Atom E620T

Reasons to consider the
Intel Atom E620T

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Much lower typical power consumption 2.68W vs 139.6W 52.1x 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 0.79 $/year vs 49.49 $/year 62.3x lower annual home energy cost
Much lower annual commercial energy cost 2.89 $/year vs 138.93 $/year 48.1x 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 Core i7 3820  vs Atom E620T 

clock speed

Core i7 3820
3.6 GHz
Atom E620T
0.6 GHz

L2 cache

Atom E620T
0.5 MB

overclocked clock speed (air)

Core i7 3820
4.68 GHz
Atom E620T
0.6 GHz

overclocked clock speed (water)

Core i7 3820
4.71 GHz
Atom E620T
0.6 GHz

TDP

Specifications Full list of technical specs

summary

Core i7 3820  vs
Atom E620T 
Clock speed 3.6 GHz 0.6 GHz
Cores Quad core Single core

features

Has a NX bit Yes Yes
Supports trusted computing No 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 130W 3.3W
Annual home energy cost 49.49 $/year 0.79 $/year
Annual commercial energy cost 138.93 $/year 2.89 $/year
Typical power consumption 139.6W 2.68W

bus

Architecture DMI 2.0 FSB
Number of links 1 1

details

Core i7 3820  vs
Atom E620T 
Architecture x86-64 x86
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
Clock multiplier 36 6
Voltage range 0.6 - 1.35V 0.75 - 0.9V

overclocking

Overclocked clock speed 4.68 GHz 0.6 GHz
Overclocked clock speed (Water) 4.71 GHz 0.6 GHz
Overclocked clock speed (Air) 4.68 GHz 0.6 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 Quad Channel Single Channel
Supports ECC No No
Maximum bandwidth 51,200 MB/s 6,400 MB/s
Maximum memory size 65,771.52 MB 2,048 MB
Intel Core i7 3820
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Intel Atom E620T
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