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Differences What are the advantages of each

Front view of Intel Xeon X5355

Reasons to consider the
Intel Xeon X5355

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Much more l2 cache 8 MB vs 2 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 2.66 GHz vs 2 GHz Around 35% higher clock speed
More cores 4 vs 2 Twice as many cores; run more applications at once
Much more l2 cache per core 2 MB/core vs 1 MB/core 2x more l2 cache per core
Much better overclocked clock speed (Air) 3.24 GHz vs 2 GHz More than 60% better overclocked clock speed (Air)
Newer manufacturing process 65 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More threads 4 vs 2 Twice as many threads
Much better overclocked clock speed (Water) 2.66 GHz vs 2 GHz Around 35% better overclocked clock speed (Water)
Newer Nov, 2006 vs May, 2005 Release date over 1 years later
Front view of AMD Opteron 270

Reasons to consider the
AMD Opteron 270

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Significantly lower typical power consumption 69.06W vs 97.5W Around 30% lower typical power consumption
Significantly lower annual commercial energy cost 74.46 $/year vs 105.12 $/year Around 30% lower annual commercial energy cost
Significantly lower annual home energy cost 20.48 $/year vs 28.91 $/year Around 30% lower annual home energy cost

Benchmarks Real world tests of Xeon X5355 vs Opteron 270

PassMark Data courtesy Passmark

Xeon X5355
3,266
Opteron 270
1,083

Specifications Full list of technical specs

summary

Xeon X5355  vs
Opteron 270 
Clock speed 2.66 GHz 2 GHz
Cores Quad core Dual core
Socket type
LGA 771
940

features

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

details

Xeon X5355  vs
Opteron 270 
Threads 4 2
L2 cache 8 MB 2 MB
L2 cache per core 2 MB/core 1 MB/core
Manufacture process 65 nm 90 nm
Max CPUs 2 2
Clock multiplier 8 10
Voltage range 1 - 1.5V 1.2 - UnknownV
Operating temperature Unknown - 70°C 0 - 67°C

overclocking

Overclocked clock speed 3.24 GHz 2 GHz
Overclocked clock speed (Water) 2.66 GHz 2 GHz
Overclocked clock speed (Air) 3.24 GHz 2 GHz

power consumption

TDP 120W 85W
Annual home energy cost 28.91 $/year 20.48 $/year
Annual commercial energy cost 105.12 $/year 74.46 $/year
Performance per watt 1.37 pt/W 0.52 pt/W
Typical power consumption 97.5W 69.06W
Intel Xeon X5355
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AMD Opteron 270
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