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Differences What are the advantages of each

Front view of Intel Xeon E5-2403

Reasons to consider the
Intel Xeon E5-2403

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Much more l3 cache 10 MB vs 6 MB More than 65% 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 2.5 MB/core vs 1.5 MB/core More than 65% more l3 cache per core
Newer May, 2012 vs Feb, 2009 Release date over 3 years later
Front view of AMD Opteron 8387

Reasons to consider the
AMD Opteron 8387

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Much higher clock speed 2.8 GHz vs 1.8 GHz More than 55% higher clock speed
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
Supports more CPUs in SMP configuration 8 vs 2 6 supports more CPUs in SMP configuration
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core

Features Key features of the Xeon E5-2403  vs Opteron 8387 

clock speed

Xeon E5-2403
1.8 GHz
Opteron 8387
2.8 GHz

L2 cache

L3 cache

Specifications Full list of technical specs

summary

Xeon E5-2403  vs
Opteron 8387 
Clock speed 1.8 GHz 2.8 GHz
Cores Quad core Quad core

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 80W 75W
Annual home energy cost 19.27 $/year 18.07 $/year
Annual commercial energy cost 70.08 $/year 65.7 $/year
Typical power consumption 65W 60.94W

details

Xeon E5-2403  vs
Opteron 8387 
Threads 4 4
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 10 MB 6 MB
L3 cache per core 2.5 MB/core 1.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 8
Voltage range 0.6 - 1.35V 1.32 - UnknownV

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

Architecture QPI HyperTransport 3.0
Clock speed 3,200 MHz 2,200 MHz
Intel Xeon E5-2403
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AMD Opteron 8387
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