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Differences What are the advantages of each

Front view of Intel Xeon E5 1620 v2

Reasons to consider the
Intel Xeon E5 1620 v2

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Much higher clock speed 3.7 GHz vs 2.5 GHz Around 50% higher clock speed
Much better overclocked clock speed (Air) 4.21 GHz vs 2 GHz More than 2x better overclocked clock speed (Air)
More l3 cache 10 MB vs 8 MB 25% more l3 cache; more data can be stored in the l3 cache for quick access later
Supports more RAM 262,144 MB vs 32,768 MB Supports 8x more RAM
Much better overclocked clock speed (Water) 4.03 GHz vs 2 GHz More than 2x better overclocked clock speed (Water)
More l3 cache per core 2.5 MB/core vs 2 MB/core 25% more l3 cache per core
Front view of Intel Xeon E3-1125C v2

Reasons to consider the
Intel Xeon E3-1125C v2

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Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed
Much higher Maximum operating temperature 100 °C vs 70 °C Around 45% higher Maximum operating temperature
Much lower typical power consumption 32.5W vs 105.63W 3.2x lower typical power consumption
Much lower annual commercial energy cost 35.04 $/year vs 113.88 $/year 3.3x lower annual commercial energy cost
Much lower annual home energy cost 9.64 $/year vs 31.32 $/year 3.2x lower annual home energy cost

Features Key features of the Xeon E5 1620 v2  vs E3-1125C v2 

clock speed

L2 cache

L3 cache

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Xeon E5 1620 v2  vs
E3-1125C v2 
Clock speed 3.7 GHz 2.5 GHz
Cores Quad core Quad core
Socket type
LGA 2011
BGA 1284
Is unlocked No No

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
F16C
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling No Yes

power consumption

TDP 130W 40W
Annual home energy cost 31.32 $/year 9.64 $/year
Annual commercial energy cost 113.88 $/year 35.04 $/year
Typical power consumption 105.63W 32.5W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Quad Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 59,733.32 MB/s 12,800 MB/s
Maximum memory size 262,144 MB 32,768 MB

details

Xeon E5 1620 v2  vs
E3-1125C v2 
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 10 MB 8 MB
L3 cache per core 2.5 MB/core 2 MB/core
Manufacture process 22 nm 22 nm
Max CPUs 1 1
Clock multiplier 37 18
Voltage range 0.65 - 1.3V 0.8 - 1.35V
Operating temperature Unknown - 70°C 0 - 100°C

overclocking

Overclocked clock speed 4.21 GHz 2 GHz
Overclocked clock speed (Water) 4.03 GHz 2 GHz
Overclocked clock speed (Air) 4.21 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

Number of links 0 1
Intel Xeon E5 1620 v2
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Intel Xeon E3-1125C v2
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