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Differences What are the advantages of each

Front view of Intel Core i5 2500K

Reasons to consider the
Intel Core i5 2500K

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Much newer manufacturing process 32 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 3.3 GHz vs 2.6 GHz More than 25% higher clock speed
Much better overclocked clock speed (Air) 4.98 GHz vs 2.73 GHz Around 85% better overclocked clock speed (Air)
Much better performance per watt 6.79 pt/W vs 0.46 pt/W More than 14.8x better performance per watt
Significantly better PassMark score 6,383 vs 760 Around 8.5x better PassMark score
More cores 4 vs 1 3 more cores; run more applications at once
Newer Jan, 2011 vs Feb, 2005 Release date over 5 years later
More threads 4 vs 1 3 more threads
Much better overclocked clock speed (Water) 4.88 GHz vs 2.6 GHz Around 90% better overclocked clock speed (Water)
Higher Maximum operating temperature 72.6 °C vs 67 °C Around 10% higher Maximum operating temperature
Front view of AMD Opteron 252

Reasons to consider the
AMD Opteron 252

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Much lower typical power consumption 55.25W vs 112.55W 2x 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 41.29 $/year 2.5x lower annual home energy cost
Much lower annual commercial energy cost 59.57 $/year vs 110.03 $/year More than 45% lower annual commercial energy cost

Benchmarks Real world tests of Core i5 2500K vs Opteron 252

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Core i5 2500K  vs
Opteron 252 
Clock speed 3.3 GHz 2.6 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
EM64T
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

details

Core i5 2500K  vs
Opteron 252 
Threads 4 1
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 1 2
Clock multiplier 33 13
Voltage range 1.2 - 1.5V 1.3 - UnknownV
Operating temperature 5 - 72.6°C 0 - 67°C

overclocking

Overclocked clock speed 4.98 GHz 2.73 GHz
Overclocked clock speed (Water) 4.88 GHz 2.6 GHz
PassMark (Overclocked) 5,433.6 1,037.9
Overclocked clock speed (Air) 4.98 GHz 2.73 GHz

power consumption

TDP 95W 68W
Annual home energy cost 41.29 $/year 16.38 $/year
Annual commercial energy cost 110.03 $/year 59.57 $/year
Performance per watt 6.79 pt/W 0.46 pt/W
Typical power consumption 112.55W 55.25W
Intel Core i5 2500K
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AMD Opteron 252
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