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Differences What are the advantages of each

Front view of Intel Xeon E3-1240

Reasons to consider the
Intel Xeon E3-1240

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Much higher clock speed 3.3 GHz vs 2.6 GHz More than 25% higher clock speed
Much newer manufacturing process 32 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 8 vs 2 6 more threads
Much better overclocked clock speed (Air) 3.71 GHz vs 2.75 GHz Around 35% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3.4 GHz vs 2.6 GHz More than 30% better overclocked clock speed (Water)
Newer Apr, 2011 vs Mar, 2006 Release date over 5 years later
Front view of AMD Opteron 885

Reasons to consider the
AMD Opteron 885

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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
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 8 vs 1 7 supports more CPUs in SMP configuration

Benchmarks Real world tests of Xeon E3-1240 vs Opteron 885

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E3-1240
4,280 MB/s
Opteron 885
71,800 MB/s

Specifications Full list of technical specs

summary

Xeon E3-1240  vs
Opteron 885 
Clock speed 3.3 GHz 2.6 GHz
Cores Quad core Dual core
Socket type
LGA 1155
940

features

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

details

Xeon E3-1240  vs
Opteron 885 
Threads 8 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 1 8
Clock multiplier 33 13
Operating temperature Unknown - 69.1°C 0 - 67°C

overclocking

Overclocked clock speed 3.71 GHz 2.75 GHz
Overclocked clock speed (Water) 3.4 GHz 2.6 GHz
Overclocked clock speed (Air) 3.71 GHz 2.75 GHz

power consumption

TDP 80W 85W
Annual home energy cost 19.27 $/year 20.48 $/year
Annual commercial energy cost 70.08 $/year 74.46 $/year
Performance per watt 2.17 pt/W 1.56 pt/W
Typical power consumption 65W 69.06W
Intel Xeon E3-1240
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AMD Opteron 885
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