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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 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3.4 GHz vs 1.8 GHz Around 90% higher clock speed
Much better overclocked clock speed (Air) 4.59 GHz vs 2.19 GHz More than 2x better overclocked clock speed (Air)
Newer Apr, 2012 vs May, 2005 Release date over 7 years later
More cores 4 vs 2 Twice as many cores; run more applications at once
Much better overclocked clock speed (Water) 4.71 GHz vs 1.8 GHz More than 2.5x better overclocked clock speed (Water)
More threads 4 vs 2 Twice as many threads
Front view of AMD Opteron 265

Reasons to consider the
AMD Opteron 265

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Significantly 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 lower typical power consumption 55.25W vs 107.5W Around 50% lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much lower annual home energy cost 16.38 $/year vs 38.81 $/year 2.4x lower annual home energy cost
Much lower annual commercial energy cost 59.57 $/year vs 106 $/year Around 45% lower annual commercial energy cost

Features Key features of the Core i5 3570K  vs Opteron 265 

clock speed

Core i5 3570K
3.4 GHz
Opteron 265
1.8 GHz

L2 cache

overclocked clock speed (air)

Core i5 3570K
4.59 GHz
Opteron 265
2.19 GHz

overclocked clock speed (water)

Core i5 3570K
4.71 GHz
Opteron 265
1.8 GHz

Specifications Full list of technical specs

summary

Core i5 3570K  vs
Opteron 265 
Clock speed 3.4 GHz 1.8 GHz
Cores Quad core Dual core
Socket type
LGA 1155
940

features

Has a NX bit Yes Yes
Instruction set extensions
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
Opteron 265 
Threads 4 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 22 nm 90 nm
Max CPUs 1 2
Clock multiplier 34 9
Operating temperature Unknown - 67.4°C 0 - 67°C

overclocking

Overclocked clock speed 4.59 GHz 2.19 GHz
Overclocked clock speed (Water) 4.71 GHz 1.8 GHz
Overclocked clock speed (Air) 4.59 GHz 2.19 GHz

power consumption

TDP 77W 68W
Annual home energy cost 38.81 $/year 16.38 $/year
Annual commercial energy cost 106 $/year 59.57 $/year
Typical power consumption 107.5W 55.25W
Intel Core i5 3570K
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AMD Opteron 265
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