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Differences What are the advantages of each

Front view of Intel Core i5 2500

Reasons to consider the
Intel Core i5 2500

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Much higher clock speed 3.3 GHz vs 1.25 GHz Around 2.8x higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
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
Much better overclocked clock speed (Air) 3.7 GHz vs 1.25 GHz Around 3x better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.21 GHz vs 1.25 GHz More than 3.2x better overclocked clock speed (Water)
Front view of Intel Atom C2508

Reasons to consider the
Intel Atom C2508

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Much lower typical power consumption 7.72W vs 77.19W 10x lower typical power consumption
Significantly newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Newer Apr, 2014 vs Jan, 2011 Release date over 3 years later
Much lower annual home energy cost 2.29 $/year vs 22.89 $/year 10x lower annual home energy cost
Much lower annual commercial energy cost 8.32 $/year vs 83.22 $/year 10x lower annual commercial energy cost

Features Key features of the Core i5 2500  vs Atom C2508 

clock speed

Core i5 2500
3.3 GHz
Atom C2508
1.25 GHz

overclocked clock speed (air)

Core i5 2500
3.7 GHz
Atom C2508
1.25 GHz

overclocked clock speed (water)

Core i5 2500
4.21 GHz
Atom C2508
1.25 GHz

TDP

Specifications Full list of technical specs

summary

Core i5 2500  vs
Atom C2508 
Clock speed 3.3 GHz 1.25 GHz
Cores Quad core Quad core

features

Has a NX bit Yes Yes
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 No

power consumption

TDP 95W 9.5W
Annual home energy cost 22.89 $/year 2.29 $/year
Annual commercial energy cost 83.22 $/year 8.32 $/year
Typical power consumption 77.19W 7.72W

bus

Architecture DMI FSB
Number of links 1 1

details

Core i5 2500  vs
Atom C2508 
Threads 4 4
Manufacture process 32 nm 22 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.7 GHz 1.25 GHz
Overclocked clock speed (Water) 4.21 GHz 1.25 GHz
Overclocked clock speed (Air) 3.7 GHz 1.25 GHz

integrated graphics

GPU GPU None
Label Intel® HD Graphics 2000 N/A
Number of displays supported 2 N/A
GPU clock speed 850 MHz N/A
Turbo clock speed 1,100 MHz N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Supports ECC No Yes
Maximum bandwidth 21,333.32 MB/s 21,333.32 MB/s
Maximum memory size 32,768 MB 32,768 MB
Intel Core i5 2500
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Intel Atom C2508
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