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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 newer manufacturing process 32 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3.3 GHz vs 1.8 GHz Around 85% higher clock speed
Much better overclocked clock speed (Air) 3.7 GHz vs 1.97 GHz More than 85% better overclocked clock speed (Air)
Newer Jan, 2011 vs Sep, 2003 Release date over 7 years later
More cores 4 vs 1 3 more cores; run more applications at once
More threads 4 vs 1 3 more threads
Much better overclocked clock speed (Water) 4.21 GHz vs 1.8 GHz More than 2.2x better overclocked clock speed (Water)
Front view of AMD Opteron 844

Reasons to consider the
AMD Opteron 844

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Lower typical power consumption 68.82W vs 77.19W More than 10% lower typical power consumption
Lower annual home energy cost 20.4 $/year vs 22.89 $/year More than 10% lower annual home energy cost
Lower annual commercial energy cost 74.2 $/year vs 83.22 $/year More than 10% lower annual commercial energy cost

Features Key features of the Core i5 2500  vs Opteron 844 

clock speed

Core i5 2500
3.3 GHz
Opteron 844
1.8 GHz

L2 cache

overclocked clock speed (air)

Core i5 2500
3.7 GHz
Opteron 844
1.97 GHz

overclocked clock speed (water)

Core i5 2500
4.21 GHz
Opteron 844
1.8 GHz

TDP

Specifications Full list of technical specs

summary

Core i5 2500  vs
Opteron 844 
Clock speed 3.3 GHz 1.8 GHz
Cores Quad core Single core
Socket type
LGA 1155
940

features

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

details

Core i5 2500  vs
Opteron 844 
Threads 4 1
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 32 nm 130 nm
Max CPUs 1 8
Clock multiplier 33 9
Operating temperature Unknown - 72.6°C 0 - 71°C

overclocking

Overclocked clock speed 3.7 GHz 1.97 GHz
Overclocked clock speed (Water) 4.21 GHz 1.8 GHz
Overclocked clock speed (Air) 3.7 GHz 1.97 GHz

power consumption

TDP 95W 84.7W
Annual home energy cost 22.89 $/year 20.4 $/year
Annual commercial energy cost 83.22 $/year 74.2 $/year
Typical power consumption 77.19W 68.82W
Intel Core i5 2500
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AMD Opteron 844
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