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Differences What are the advantages of each

Front view of AMD Opteron 840

Reasons to consider the
AMD Opteron 840

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
Front view of AMD Athlon II X2 245

Reasons to consider the
AMD Athlon II X2 245

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Much newer manufacturing process 45 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 2.9 GHz vs 1.4 GHz More than 2x higher clock speed
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 better overclocked clock speed (Air) 3.64 GHz vs 1.69 GHz Around 2.2x better overclocked clock speed (Air)
Newer Jul, 2009 vs Jun, 2003 Release date over 6 years later
Lower typical power consumption 52.81W vs 66.71W More than 20% lower typical power consumption
Much better overclocked clock speed (Water) 4 GHz vs 1.4 GHz More than 2.8x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once
Lower annual home energy cost 15.66 $/year vs 19.78 $/year More than 20% lower annual home energy cost
Lower annual commercial energy cost 56.94 $/year vs 71.92 $/year More than 20% lower annual commercial energy cost

Features Key features of the Opteron 840  vs Athlon II X2 245 

clock speed

Opteron 840
1.4 GHz

L2 cache

overclocked clock speed (air)

Opteron 840
1.69 GHz
Athlon II X2 245
3.64 GHz

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Opteron 840  vs
Athlon II X2 245 
Clock speed 1.4 GHz 2.9 GHz
Cores Single core Dual core
Socket type
940
AM3

features

Has a NX bit Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!

details

Opteron 840  vs
Athlon II X2 245 
Threads 1 2
L2 cache 1 MB 2 MB
L2 cache per core 1 MB/core 1 MB/core
Manufacture process 130 nm 45 nm
Max CPUs 8 1
Voltage range 1.5 - UnknownV 0.85 - 1.4V

overclocking

Overclocked clock speed 1.69 GHz 3.64 GHz
Overclocked clock speed (Water) 1.4 GHz 4 GHz
Overclocked clock speed (Air) 1.69 GHz 3.64 GHz

power consumption

TDP 82.1W 65W
Annual home energy cost 19.78 $/year 15.66 $/year
Annual commercial energy cost 71.92 $/year 56.94 $/year
Typical power consumption 66.71W 52.81W
AMD Opteron 840
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AMD Athlon II X2 245
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