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Differences What are the advantages of each

Front view of AMD Opteron 856

Reasons to consider the
AMD Opteron 856

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Much higher clock speed 3 GHz vs 2.6 GHz More than 15% higher clock speed
Supports more CPUs in SMP configuration 8 vs 2 6 supports more CPUs in SMP configuration
Much better overclocked clock speed (Air) 3.1 GHz vs 2.6 GHz Around 20% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3 GHz vs 2.6 GHz More than 15% better overclocked clock speed (Water)
Front view of AMD Opteron 285

Reasons to consider the
AMD Opteron 285

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Much 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
More threads 2 vs 1 Twice as many threads
Lower typical power consumption 69.06W vs 75.24W Around 10% lower typical power consumption
Lower annual commercial energy cost 74.46 $/year vs 81.12 $/year Around 10% lower annual commercial energy cost
Lower annual home energy cost 20.48 $/year vs 22.31 $/year Around 10% lower annual home energy cost

Features Key features of the Opteron 856  vs 285 

clock speed

Opteron 856
3 GHz
Opteron 285
2.6 GHz

L2 cache

overclocked clock speed (air)

Opteron 856
3.1 GHz
Opteron 285
2.6 GHz

overclocked clock speed (water)

Opteron 856
3 GHz
Opteron 285
2.6 GHz

TDP

Specifications Full list of technical specs

summary

Opteron 856  vs
285 
Clock speed 3 GHz 2.6 GHz
Cores Single core Dual core
Socket type
940

features

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

details

Opteron 856  vs
285 
Threads 1 2
L2 cache 1 MB 2 MB
L2 cache per core 1 MB/core 1 MB/core
Manufacture process 90 nm 90 nm
Max CPUs 8 2
Clock multiplier 15 13
Voltage range 1.3 - UnknownV 1 - UnknownV
Operating temperature 0 - 67°C 0 - 67°C

overclocking

Overclocked clock speed 3.1 GHz 2.6 GHz
Overclocked clock speed (Water) 3 GHz 2.6 GHz
Overclocked clock speed (Air) 3.1 GHz 2.6 GHz

power consumption

TDP 92.6W 85W
Annual home energy cost 22.31 $/year 20.48 $/year
Annual commercial energy cost 81.12 $/year 74.46 $/year
Typical power consumption 75.24W 69.06W
AMD Opteron 856
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AMD Opteron 285
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