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Differences What are the advantages of each

Front view of Intel Xeon E5-2420

Reasons to consider the
Intel Xeon E5-2420

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Much more l3 cache 15 MB vs 2 MB 7.5x more l3 cache; more data can be stored in the l3 cache for quick access later
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
More cores 6 vs 4 2 more cores; run more applications at once
Much better performance per watt 5.47 pt/W vs 2.16 pt/W More than 2.5x better performance per watt
More threads 12 vs 4 Three times as many threads
Significantly newer manufacturing process 32 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l3 cache per core 2.5 MB/core vs 0.5 MB/core 5x more l3 cache per core
Newer May, 2012 vs Apr, 2008 Release date over 4 years later
Front view of AMD Opteron 8356

Reasons to consider the
AMD Opteron 8356

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Much higher clock speed 2.3 GHz vs 1.9 GHz More than 20% higher clock speed
Supports more CPUs in SMP configuration 8 vs 2 6 supports more CPUs in SMP configuration
Lower typical power consumption 60.94W vs 77.19W More than 20% lower typical power consumption
Significantly more l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core
Much better overclocked clock speed (Water) 2.3 GHz vs 1.9 GHz More than 20% better overclocked clock speed (Water)
Better overclocked clock speed (Air) 2.43 GHz vs 2.36 GHz Around 5% better overclocked clock speed (Air)
Lower annual commercial energy cost 65.7 $/year vs 83.22 $/year More than 20% lower annual commercial energy cost
Lower annual home energy cost 18.07 $/year vs 22.89 $/year More than 20% lower annual home energy cost

Benchmarks Real world tests of Xeon E5-2420 vs Opteron 8356

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5-2420
10,344
Opteron 8356
13,936

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5-2420
985,150 MB/s
Opteron 8356
79.5 MB/s

Specifications Full list of technical specs

summary

Xeon E5-2420  vs
Opteron 8356 
Clock speed 1.9 GHz 2.3 GHz
Cores Hexa core Quad core
Is unlocked Yes No

features

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

power consumption

TDP 95W 75W
Annual home energy cost 22.89 $/year 18.07 $/year
Annual commercial energy cost 83.22 $/year 65.7 $/year
Performance per watt 5.47 pt/W 2.16 pt/W
Typical power consumption 77.19W 60.94W

details

Xeon E5-2420  vs
Opteron 8356 
Threads 12 4
L2 cache 2 MB 2 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
L3 cache 15 MB 2 MB
L3 cache per core 2.5 MB/core 0.5 MB/core
Manufacture process 32 nm 65 nm
Max CPUs 2 8
Voltage range 0.6 - 1.35V 1 - UnknownV

overclocking

Overclocked clock speed 2.36 GHz 2.43 GHz
Overclocked clock speed (Water) 1.9 GHz 2.3 GHz
Overclocked clock speed (Air) 2.36 GHz 2.43 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A

bus

Clock speed 3,600 MHz 1,000 MHz
Intel Xeon E5-2420
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AMD Opteron 8356
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