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Differences What are the advantages of each

Front view of Intel Core i5 580M

Reasons to consider the
Intel Core i5 580M

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Much higher clock speed 2.66 GHz vs 1 GHz Around 2.8x 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
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Air) 3.1 GHz vs 1 GHz More than 3x better overclocked clock speed (Air)
Significantly higher GPU clock speed 500 MHz vs 320 MHz More than 55% higher GPU clock speed
More cores 2 vs 1 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much better overclocked clock speed (Water) 2.67 GHz vs 1 GHz Around 2.8x better overclocked clock speed (Water)
Front view of Intel Atom E645C

Reasons to consider the
Intel Atom E645C

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Significantly lower typical power consumption 5.69W vs 28.44W 5x lower typical power consumption
Significantly lower annual home energy cost 1.69 $/year vs 8.43 $/year 5x lower annual home energy cost
Significantly lower annual commercial energy cost 6.13 $/year vs 30.66 $/year 5x lower annual commercial energy cost

Features Key features of the Core i5 580M  vs Atom E645C 

clock speed

Core i5 580M
2.66 GHz
Atom E645C
1 GHz

L2 cache

Atom E645C
0.5 MB

gpu clock speed

Core i5 580M
500 MHz
Atom E645C
320 MHz

overclocked clock speed (air)

Core i5 580M
3.1 GHz
Atom E645C
1 GHz

overclocked clock speed (water)

Core i5 580M
2.67 GHz
Atom E645C
1 GHz

Specifications Full list of technical specs

summary

Core i5 580M  vs
Atom E645C 
Clock speed 2.66 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
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 35W 7W
Annual home energy cost 8.43 $/year 1.69 $/year
Annual commercial energy cost 30.66 $/year 6.13 $/year
Typical power consumption 28.44W 5.69W

bus

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

details

Core i5 580M  vs
Atom E645C 
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 32 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.1 GHz 1 GHz
Overclocked clock speed (Water) 2.67 GHz 1 GHz
Overclocked clock speed (Air) 3.1 GHz 1 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics Integrated
GPU clock speed 500 MHz 320 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1066
DDR3
DDR3-800
DDR2-800
DDR2
Channels Dual Channel Single Channel
Supports ECC No No
Maximum bandwidth 17,066.66 MB/s 6,400 MB/s
Maximum memory size 8,192 MB 3,000.32 MB
Intel Core i5 580M
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Intel Atom E645C
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