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Differences What are the advantages of each

Front view of AMD Opteron 246

Reasons to consider the
AMD Opteron 246

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Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Significantly higher Maximum operating temperature 71 °C vs 49 °C Around 45% higher Maximum operating temperature
Front view of AMD Athlon X2 4200+

Reasons to consider the
AMD Athlon X2 4200+

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Much newer manufacturing process 90 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 2.2 GHz vs 2 GHz More than 10% higher clock speed
More cores 2 vs 1 Twice as many cores; run more applications at once
Newer May, 2005 vs Aug, 2003 Release date over 1 years later
Better overclocked clock speed (Air) 2.65 GHz vs 2.31 GHz Around 15% better overclocked clock speed (Air)
Significantly better overclocked clock speed (Water) 2.9 GHz vs 2 GHz More than 45% better overclocked clock speed (Water)

Benchmarks Real world tests of Opteron 246 vs Athlon X2 4200+

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Opteron 246  vs
Athlon X2 4200+ 
Clock speed 2 GHz 2.2 GHz
Cores Single core Dual core
Socket type
940
AM2
939

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
3DNow!
Supports dynamic frequency scaling Yes Yes

details

Opteron 246  vs
Athlon X2 4200+ 
Threads 1 2
L2 cache 1 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 130 nm 90 nm
Max CPUs 2 1
Operating temperature 0 - 71°C Unknown - 49°C

overclocking

Overclocked clock speed 2.31 GHz 2.65 GHz
Overclocked clock speed (Water) 2 GHz 2.9 GHz
PassMark (Overclocked) 851.3 948.2
Overclocked clock speed (Air) 2.31 GHz 2.65 GHz

power consumption

TDP 89W 89W
Annual home energy cost 21.44 $/year 21.44 $/year
Annual commercial energy cost 77.96 $/year 77.96 $/year
Performance per watt 0.29 pt/W 0.52 pt/W
Typical power consumption 72.31W 72.31W
AMD Opteron 246
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AMD Athlon X2 4200+
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