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Differences What are the advantages of each

Front view of Intel Core i5 3570K

Reasons to consider the
Intel Core i5 3570K

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Much newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much better overclocked clock speed (Air) 4.59 GHz vs 3.4 GHz More than 35% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.71 GHz vs 3.4 GHz Around 40% better overclocked clock speed (Water)
Newer Apr, 2012 vs Jan, 2011 Release date over 1 years later
Front view of AMD Phenom II X2 511

Reasons to consider the
AMD Phenom II X2 511

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Much more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Much lower typical power consumption 52.81W vs 107.5W 2x lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 38.81 $/year 2.5x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 106 $/year More than 45% lower annual commercial energy cost

Benchmarks Real world tests of Core i5 3570K vs Phenom II X2 511

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i5 3570K
2,650,000 MB/s
Phenom II X2 511
134,650 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i5 3570K  vs
Phenom II X2 511 
Clock speed 3.4 GHz 3.4 GHz
Cores Quad core Dual core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

details

Core i5 3570K  vs
Phenom II X2 511 
Threads 4 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 22 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.59 GHz 3.4 GHz
Overclocked clock speed (Water) 4.71 GHz 3.4 GHz
Overclocked clock speed (Air) 4.59 GHz 3.4 GHz

power consumption

TDP 77W 65W
Annual home energy cost 38.81 $/year 15.66 $/year
Annual commercial energy cost 106 $/year 56.94 $/year
Performance per watt 4.69 pt/W 2 pt/W
Typical power consumption 107.5W 52.81W
Intel Core i5 3570K
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AMD Phenom II X2 511
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