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Differences What are the advantages of each

Front view of Intel Xeon E5540

Reasons to consider the
Intel Xeon E5540

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Much better overclocked clock speed (Air) 3.57 GHz vs 2.7 GHz More than 30% better overclocked clock speed (Air)
More threads 8 vs 6 2 more threads
Much better overclocked clock speed (Water) 4.45 GHz vs 2.7 GHz Around 65% better overclocked clock speed (Water)
Significantly more l3 cache per core 2 MB/core vs 1.33 MB/core More than 50% more l3 cache per core
Lower typical power consumption 65W vs 77.19W More than 15% lower typical power consumption
Lower annual commercial energy cost 70.08 $/year vs 83.22 $/year More than 15% lower annual commercial energy cost
Lower annual home energy cost 19.27 $/year vs 22.89 $/year More than 15% lower annual home energy cost
Front view of AMD Opteron 4226

Reasons to consider the
AMD Opteron 4226

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Much more l2 cache 6 MB vs 1 MB 6x more l2 cache; more data can be stored in the l2 cache for quick access later
Higher clock speed 2.7 GHz vs 2.53 GHz More than 5% higher clock speed
More cores 6 vs 4 2 more cores; run more applications at once
Higher turbo clock speed 3.1 GHz vs 2.8 GHz More than 10% higher turbo clock speed
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Newer Nov, 2011 vs Mar, 2009 Release date over 2 years later

Features Key features of the Xeon E5540  vs Opteron 4226 

clock speed

Xeon E5540
2.53 GHz
Opteron 4226
2.7 GHz

turbo clock speed

Xeon E5540
2.8 GHz
Opteron 4226
3.1 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon E5540
3.57 GHz
Opteron 4226
2.7 GHz

overclocked clock speed (water)

Xeon E5540
4.45 GHz
Opteron 4226
2.7 GHz

Specifications Full list of technical specs

summary

Xeon E5540  vs
Opteron 4226 
Clock speed 2.53 GHz 2.7 GHz
Turbo clock speed 2.8 GHz 3.1 GHz
Cores Quad core Hexa core
Socket type
LGA 1366
C32

features

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

power consumption

TDP 80W 95W
Annual home energy cost 19.27 $/year 22.89 $/year
Annual commercial energy cost 70.08 $/year 83.22 $/year
Typical power consumption 65W 77.19W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1066
DDR3-800
DDR3

details

Xeon E5540  vs
Opteron 4226 
Threads 8 6
L2 cache 1 MB 6 MB
L2 cache per core 0.25 MB/core 1 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 1.33 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 2 2
Clock multiplier 19 15
Operating temperature Unknown - 76°C Unknown - 70.5°C

overclocking

Overclock popularity 0 0
Overclocked clock speed 3.57 GHz 2.7 GHz
Overclocked clock speed (Water) 4.45 GHz 2.7 GHz
Overclocked clock speed (Air) 3.57 GHz 2.7 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

Architecture QPI HyperTransport 3.0
Number of links 2 2
Transfer rate 5,860 MT/s 6,400 MT/s
Clock speed 2,930 MHz 3,200 MHz
Intel Xeon E5540
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AMD Opteron 4226
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