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Differences What are the advantages of each

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 212W 6.5x lower typical power consumption
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower annual home energy cost 9.64 $/year vs 82.69 $/year 8.6x lower annual home energy cost
Much lower annual commercial energy cost 35.04 $/year vs 211.12 $/year 6x lower annual commercial energy cost
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Newer Apr, 2012 vs Jun, 2009 Release date over 2 years later
Front view of Intel Core i7 975

Reasons to consider the
Intel Core i7 975

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Much higher clock speed 3.33 GHz vs 2 GHz More than 65% higher clock speed
Much better overclocked clock speed (Air) 4.46 GHz vs 2 GHz Around 2.2x better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.45 GHz vs 2 GHz Around 2.2x better overclocked clock speed (Water)

Features Key features of the Xeon E3-1125C  vs Core i7 975 

clock speed

Core i7 975
3.33 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Core i7 975
4.46 GHz

overclocked clock speed (water)

Core i7 975
4.45 GHz

TDP

Specifications Full list of technical specs

summary

Xeon E3-1125C  vs
Core i7 975 
Clock speed 2 GHz 3.33 GHz
Cores Quad core Quad core

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 40W 130W
Annual home energy cost 9.64 $/year 82.69 $/year
Annual commercial energy cost 35.04 $/year 211.12 $/year
Typical power consumption 32.5W 212W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Dual Channel Triple Channel
Supports ECC Yes No
Maximum bandwidth 25,600 MB/s 25,599.99 MB/s
Maximum memory size 32,768 MB 24,000 MB

details

Xeon E3-1125C  vs
Core i7 975 
Architecture x86-64 x86-64
Threads 8 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 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2 GHz 4.46 GHz
Overclocked clock speed (Water) 2 GHz 4.45 GHz
Overclocked clock speed (Air) 2 GHz 4.46 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 QPI
Number of links 1 1
Transfer rate 5,000 MT/s 6,400 MT/s
Intel Xeon E3-1125C
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Intel Core i7 975
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