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Differences What are the advantages of each

Front view of Intel Xeon E5420

Reasons to consider the
Intel Xeon E5420

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Much more l2 cache 12 MB vs 2 MB 6x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 2.5 GHz vs 2.2 GHz Around 15% higher clock speed
Much more l2 cache per core 3 MB/core vs 1 MB/core 3x more l2 cache per core
More cores 4 vs 2 Twice as many cores; run more applications at once
Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 3.19 GHz vs 2.2 GHz More than 45% better overclocked clock speed (Air)
More threads 4 vs 2 Twice as many threads
Much better overclocked clock speed (Water) 3.94 GHz vs 2.2 GHz Around 80% better overclocked clock speed (Water)
Newer Nov, 2007 vs May, 2005 Release date over 2 years later
Front view of AMD Opteron 275

Reasons to consider the
AMD Opteron 275

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CPUBoss is not aware of any important advantages of the AMD Opteron 275 vs the Intel Xeon E5420.

Benchmarks Real world tests of Xeon E5420 vs Opteron 275

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5420
5,821
Opteron 275
2,534

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5420
106,200 MB/s
Opteron 275
60,200 MB/s

PassMark Data courtesy Passmark

Xeon E5420
3,534
Opteron 275
1,291

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E5420  vs
Opteron 275 
Clock speed 2.5 GHz 2.2 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
SSE4.1
3DNow!
Supports dynamic frequency scaling Yes Yes

details

Xeon E5420  vs
Opteron 275 
Threads 4 2
L2 cache 12 MB 2 MB
L2 cache per core 3 MB/core 1 MB/core
Manufacture process 45 nm 90 nm
Max CPUs 2 2
Clock multiplier 7 11
Voltage range 0.85 - 1.35V 1.2 - UnknownV
Operating temperature Unknown - 67°C 0 - 67°C

overclocking

Overclocked clock speed 3.19 GHz 2.2 GHz
Overclocked clock speed (Water) 3.94 GHz 2.2 GHz
Overclocked clock speed (Air) 3.19 GHz 2.2 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 1.78 pt/W 0.87 pt/W
Typical power consumption 65W 69.06W
Intel Xeon E5420
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AMD Opteron 275
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