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Differences What are the advantages of each

Front view of Intel Xeon E3-1220

Reasons to consider the
Intel Xeon E3-1220

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Significantly higher clock speed 3.1 GHz vs 2 GHz More than 55% higher clock speed
Much better overclocked clock speed (Air) 3.49 GHz vs 2 GHz Around 75% better overclocked clock speed (Air)
Significantly better overclocked clock speed (Water) 3.1 GHz vs 2 GHz More than 55% better overclocked clock speed (Water)
Front view of Intel Xeon E3-1125C

Reasons to consider the
Intel Xeon E3-1125C

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Much lower typical power consumption 32.5W vs 65W 2x lower typical power consumption
More threads 8 vs 4 Twice as many threads
Much lower annual home energy cost 9.64 $/year vs 19.27 $/year 2x lower annual home energy cost
Much lower annual commercial energy cost 35.04 $/year vs 70.08 $/year 2x lower annual commercial energy cost
Newer Apr, 2012 vs Apr, 2011 Release date a year later

Features Key features of the Xeon E3-1220  vs E3-1125C 

clock speed

Xeon E3-1220
3.1 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon E3-1220
3.49 GHz

overclocked clock speed (water)

Xeon E3-1220
3.1 GHz

Specifications Full list of technical specs

summary

Xeon E3-1220  vs
E3-1125C 
Clock speed 3.1 GHz 2 GHz
Cores Quad core Quad core

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 40W
Annual home energy cost 19.27 $/year 9.64 $/year
Annual commercial energy cost 70.08 $/year 35.04 $/year
Typical power consumption 65W 32.5W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 21,333.32 MB/s 25,600 MB/s
Maximum memory size 32,768 MB 32,768 MB

details

Xeon E3-1220  vs
E3-1125C 
Architecture x86-64 x86-64
Threads 4 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.49 GHz 2 GHz
Overclocked clock speed (Water) 3.1 GHz 2 GHz
Overclocked clock speed (Air) 3.49 GHz 2 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 DMI DMI
Number of links 1 1
Transfer rate 5,000 MT/s 5,000 MT/s
Intel Xeon E3-1220
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Intel Xeon E3-1125C
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