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Differences What are the advantages of each

Front view of Intel Core i5 520M

Reasons to consider the
Intel Core i5 520M

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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
Much better performance per watt 13.49 pt/W vs 0.46 pt/W More than 29.5x better performance per watt
Significantly lower typical power consumption 28.44W vs 55.25W Around 50% lower typical power consumption
Newer Jan, 2010 vs Feb, 2005 Release date over 4 years later
More threads 4 vs 1 3 more threads
Better PassMark score 2,380 vs 760 Around 3.2x better PassMark score
More cores 2 vs 1 Twice as many cores; run more applications at once
Significantly lower annual home energy cost 8.43 $/year vs 16.38 $/year Around 50% lower annual home energy cost
Significantly lower annual commercial energy cost 30.66 $/year vs 59.57 $/year Around 50% lower annual commercial energy cost
Front view of AMD Opteron 252

Reasons to consider the
AMD Opteron 252

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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
Higher clock speed 2.6 GHz vs 2.4 GHz Around 10% higher clock speed
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
Slightly better overclocked clock speed (Water) 2.6 GHz vs 2.4 GHz Around 10% better overclocked clock speed (Water)

Benchmarks Real world tests of Core i5 520M vs Opteron 252

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Core i5 520M  vs
Opteron 252 
Clock speed 2.4 GHz 2.6 GHz
Cores Dual core Single core
Socket type
BGA 1288
rPGA 988A
940

features

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

details

Core i5 520M  vs
Opteron 252 
Threads 4 1
L2 cache 0.5 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 18 13

overclocking

Overclocked clock speed 2.86 GHz 2.73 GHz
Overclocked clock speed (Water) 2.4 GHz 2.6 GHz
PassMark (Overclocked) 1,455.5 1,037.9
Overclocked clock speed (Air) 2.86 GHz 2.73 GHz

power consumption

TDP 35W 68W
Annual home energy cost 8.43 $/year 16.38 $/year
Annual commercial energy cost 30.66 $/year 59.57 $/year
Performance per watt 13.49 pt/W 0.46 pt/W
Typical power consumption 28.44W 55.25W
Intel Core i5 520M
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AMD Opteron 252
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