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Differences What are the advantages of each

Front view of Intel Xeon X5560

Reasons to consider the
Intel Xeon X5560

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Much higher clock speed 2.8 GHz vs 2.5 GHz More than 10% higher clock speed
Much better overclocked clock speed (Air) 3.33 GHz vs 2.5 GHz Around 35% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.57 GHz vs 2.5 GHz Around 85% better overclocked clock speed (Water)
Much more l3 cache per core 2 MB/core vs 1 MB/core 2x more l3 cache per core
Front view of AMD Opteron 4274 HE

Reasons to consider the
AMD Opteron 4274 HE

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Much more l2 cache 8 MB vs 1 MB 8x more l2 cache; more data can be stored in the l2 cache for quick access later
More cores 8 vs 4 Twice as many cores; run more applications at once
Higher turbo clock speed 3.5 GHz vs 3.2 GHz Around 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
Significantly lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Newer Nov, 2011 vs Mar, 2009 Release date over 2 years later

Features Key features of the Xeon X5560  vs Opteron 4274 HE 

clock speed

Xeon X5560
2.8 GHz
Opteron 4274 HE
2.5 GHz

turbo clock speed

Xeon X5560
3.2 GHz
Opteron 4274 HE
3.5 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon X5560
3.33 GHz
Opteron 4274 HE
2.5 GHz

overclocked clock speed (water)

Xeon X5560
4.57 GHz
Opteron 4274 HE
2.5 GHz

Specifications Full list of technical specs

summary

Xeon X5560  vs
Opteron 4274 HE 
Clock speed 2.8 GHz 2.5 GHz
Turbo clock speed 3.2 GHz 3.5 GHz
Cores Quad core Octa 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 95W 65W
Annual home energy cost 22.89 $/year 15.66 $/year
Annual commercial energy cost 83.22 $/year 56.94 $/year
Typical power consumption 77.19W 52.81W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3-800
DDR3

details

Xeon X5560  vs
Opteron 4274 HE 
Threads 8 8
L2 cache 1 MB 8 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 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 2 2
Clock multiplier 21 12
Operating temperature Unknown - 75°C Unknown - 68°C

overclocking

Overclocked clock speed 3.33 GHz 2.5 GHz
Overclocked clock speed (Water) 4.57 GHz 2.5 GHz
Overclocked clock speed (Air) 3.33 GHz 2.5 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 6,400 MT/s 6,400 MT/s
Clock speed 3,200 MHz 3,200 MHz
Intel Xeon X5560
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AMD Opteron 4274 HE
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