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Differences What are the advantages of each

Front view of AMD Opteron 4365

Reasons to consider the
AMD Opteron 4365

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Much higher clock speed 2 GHz vs 1.6 GHz Around 25% higher clock speed
Much better overclocked clock speed (Air) 2.8 GHz vs 1.6 GHz Around 75% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 2.8 GHz vs 1.6 GHz Around 75% better overclocked clock speed (Water)
Newer Nov, 2012 vs Nov, 2011 Release date a year later
Front view of AMD Opteron 4256 EE

Reasons to consider the
AMD Opteron 4256 EE

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Slightly lower typical power consumption 28.44W vs 32.5W Around 15% lower typical power consumption
Slightly lower annual commercial energy cost 30.66 $/year vs 35.04 $/year More than 10% lower annual commercial energy cost
Slightly lower annual home energy cost 8.43 $/year vs 9.64 $/year More than 10% lower annual home energy cost

Features Key features of the Opteron 4365  vs 4256 EE 

clock speed

L2 cache

L3 cache

overclocked clock speed (air)

Opteron 4365
2.8 GHz
Opteron 4256 EE
1.6 GHz

overclocked clock speed (water)

Opteron 4365
2.8 GHz
Opteron 4256 EE
1.6 GHz

Specifications Full list of technical specs

summary

Opteron 4365  vs
4256 EE 
Clock speed 2 GHz 1.6 GHz
Cores Octa core Octa core
Socket type
AM2
C32
Is unlocked No No

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 40W 35W
Annual home energy cost 9.64 $/year 8.43 $/year
Annual commercial energy cost 35.04 $/year 30.66 $/year
Typical power consumption 32.5W 28.44W

bus

Architecture HyperTransport 3.0 HyperTransport 3.0
Transfer rate 6,400 MT/s 6,400 MT/s
Clock speed 3,200 MHz 3,200 MHz

details

Opteron 4365  vs
4256 EE 
Threads 8 8
L2 cache 8 MB 8 MB
L2 cache per core 1 MB/core 1 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 1 MB/core 1 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 2
Operating temperature Unknown - 70°C Unknown - 64°C

overclocking

Overclocked clock speed 2.8 GHz 1.6 GHz
Overclocked clock speed (Water) 2.8 GHz 1.6 GHz
Overclocked clock speed (Air) 2.8 GHz 1.6 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
AMD Opteron 4365
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AMD Opteron 4256 EE
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