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Differences What are the advantages of each

Front view of AMD Opteron 4284

Reasons to consider the
AMD Opteron 4284

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Much higher clock speed 3 GHz vs 1.6 GHz More than 85% higher clock speed
Much higher turbo clock speed 3.7 GHz vs 2.8 GHz More than 30% higher turbo clock speed
Much better overclocked clock speed (Air) 3 GHz vs 1.6 GHz More than 85% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3 GHz vs 1.6 GHz More than 85% better overclocked clock speed (Water)
Front view of AMD Opteron 4256 EE

Reasons to consider the
AMD Opteron 4256 EE

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Much lower typical power consumption 28.44W vs 77.19W 2.7x lower typical power consumption
Much lower annual commercial energy cost 30.66 $/year vs 83.22 $/year 2.7x lower annual commercial energy cost
Much lower annual home energy cost 8.43 $/year vs 22.89 $/year 2.7x lower annual home energy cost

Features Key features of the Opteron 4284  vs 4256 EE 

clock speed

turbo clock speed

Opteron 4284
3.7 GHz
Opteron 4256 EE
2.8 GHz

L2 cache

L3 cache

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Opteron 4284  vs
4256 EE 
Clock speed 3 GHz 1.6 GHz
Turbo clock speed 3.7 GHz 2.8 GHz
Cores Octa core Octa core
Socket type
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
Supplemental SSE3
AES

power consumption

TDP 95W 35W
Annual home energy cost 22.89 $/year 8.43 $/year
Annual commercial energy cost 83.22 $/year 30.66 $/year
Typical power consumption 77.19W 28.44W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3

details

Opteron 4284  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
Clock multiplier 18 14
Operating temperature Unknown - 70.5°C Unknown - 64°C

overclocking

Overclocked clock speed 3 GHz 1.6 GHz
Overclocked clock speed (Water) 3 GHz 1.6 GHz
Overclocked clock speed (Air) 3 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

bus

Architecture HyperTransport 3.0 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
AMD Opteron 4284
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AMD Opteron 4256 EE
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