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Differences What are the advantages of each

Front view of Intel Xeon E3-1220

Reasons to consider the
Intel Xeon E3-1220

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Much higher clock speed 3.1 GHz vs 2.1 GHz Around 50% higher clock speed
Much better performance per watt 12.06 pt/W vs 2.14 pt/W Around 5.8x better performance per watt
Much better overclocked clock speed (Air) 3.49 GHz vs 2.2 GHz Around 60% better overclocked clock speed (Air)
More l3 cache 8 MB vs 6 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l3 cache per core 2 MB/core vs 1 MB/core 2x more l3 cache per core
Much better overclocked clock speed (Water) 3.1 GHz vs 2.2 GHz More than 40% better overclocked clock speed (Water)
Front view of AMD Opteron 4171 HE

Reasons to consider the
AMD Opteron 4171 HE

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Much more l2 cache 3 MB vs 1 MB 3x more l2 cache; more data can be stored in the l2 cache for quick access later
More cores 6 vs 4 2 more cores; run more applications at once
Significantly lower typical power consumption 40.63W vs 65W Around 40% lower typical power consumption
More threads 6 vs 4 2 more threads
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Significantly lower annual commercial energy cost 43.8 $/year vs 70.08 $/year Around 40% lower annual commercial energy cost
Significantly lower annual home energy cost 12.04 $/year vs 19.27 $/year More than 35% lower annual home energy cost

Benchmarks Real world tests of Xeon E3-1220 vs Opteron 4171 HE

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 E3-1220
2,320,000 MB/s
Opteron 4171 HE
79,700 MB/s

Specifications Full list of technical specs

summary

Xeon E3-1220  vs
Opteron 4171 HE 
Clock speed 3.1 GHz 2.1 GHz
Cores Quad core Hexa core
Socket type
LGA 1155
C32

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES

bus

Architecture DMI HyperTransport 3.0

details

Xeon E3-1220  vs
Opteron 4171 HE 
Threads 4 6
L2 cache 1 MB 3 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 8 MB 6 MB
L3 cache per core 2 MB/core 1 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 1 2
Clock multiplier 31 10

overclocking

Overclocked clock speed 3.49 GHz 2.2 GHz
Overclocked clock speed (Water) 3.1 GHz 2.2 GHz
Overclocked clock speed (Air) 3.49 GHz 2.2 GHz

power consumption

TDP 80W 50W
Annual home energy cost 19.27 $/year 12.04 $/year
Annual commercial energy cost 70.08 $/year 43.8 $/year
Performance per watt 12.06 pt/W 2.14 pt/W
Typical power consumption 65W 40.63W
Intel Xeon E3-1220
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AMD Opteron 4171 HE
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