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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 GHz More than 3.2x 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) 3.7 GHz vs 1 GHz Around 3.8x better overclocked clock speed (Air)
More cores 4 vs 1 3 more cores; run more applications at once
Much better overclocked clock speed (Water) 4.21 GHz vs 1 GHz Around 4.2x better overclocked clock speed (Water)
More threads 4 vs 2 Twice as many threads
Newer Jan, 2011 vs May, 2010 Release date 8 months later
Front view of Intel Atom Z605

Reasons to consider the
Intel Atom Z605

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Much lower typical power consumption 1.63W vs 77.19W 47.5x lower typical power consumption
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Much lower annual home energy cost 0.48 $/year vs 22.89 $/year 47.5x lower annual home energy cost
Much lower annual commercial energy cost 1.75 $/year vs 83.22 $/year 47.5x lower annual commercial energy cost

Features Key features of the Core i5 2500  vs Atom Z605 

clock speed

Core i5 2500
3.3 GHz
Atom Z605
1 GHz

L2 cache

Atom Z605
0.5 MB

overclocked clock speed (air)

Core i5 2500
3.7 GHz
Atom Z605
1 GHz

overclocked clock speed (water)

Core i5 2500
4.21 GHz
Atom Z605
1 GHz

TDP

Specifications Full list of technical specs

summary

Core i5 2500  vs
Atom Z605 
Clock speed 3.3 GHz 1 GHz
Cores Quad core Single core

features

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

details

Core i5 2500  vs
Atom Z605 
Threads 4 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 3.7 GHz 1 GHz
Overclocked clock speed (Water) 4.21 GHz 1 GHz
Overclocked clock speed (Air) 3.7 GHz 1 GHz

power consumption

TDP 95W 2W
Annual home energy cost 22.89 $/year 0.48 $/year
Annual commercial energy cost 83.22 $/year 1.75 $/year
Typical power consumption 77.19W 1.63W
Intel Core i5 2500
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Intel Atom Z605
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