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Differences What are the advantages of each

Front view of Intel Xeon E5 4650 v2

Reasons to consider the
Intel Xeon E5 4650 v2

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Much more l3 cache 25 MB vs 15 MB More than 65% more l3 cache; more data can be stored in the l3 cache for quick access later
More threads 20 vs 12 8 more threads
Supports more RAM 786,432 MB vs 393,216 MB Supports 2x more RAM
Newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Newer Mar, 2014 vs Mar, 2012 Release date over 2 years later
Front view of Intel Xeon E5-2640

Reasons to consider the
Intel Xeon E5-2640

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Higher clock speed 2.5 GHz vs 2.4 GHz Around 5% higher clock speed
Higher turbo clock speed 3 GHz vs 2.9 GHz Around 5% higher turbo clock speed
Much better overclocked clock speed (Air) 2.9 GHz vs 2.4 GHz More than 20% better overclocked clock speed (Air)
Better overclocked clock speed (Water) 2.5 GHz vs 2.4 GHz Around 5% better overclocked clock speed (Water)

Features Key features of the Xeon E5 4650 v2  vs E5-2640 

clock speed

Xeon E5 4650 v2
2.4 GHz
Xeon E5-2640
2.5 GHz

turbo clock speed

L3 cache

overclocked clock speed (air)

Xeon E5 4650 v2
2.4 GHz
Xeon E5-2640
2.9 GHz

overclocked clock speed (water)

Xeon E5 4650 v2
2.4 GHz
Xeon E5-2640
2.5 GHz

Specifications Full list of technical specs

summary

Xeon E5 4650 v2  vs
E5-2640 
Clock speed 2.4 GHz 2.5 GHz
Turbo clock speed 2.9 GHz 3 GHz
Cores Dodeca core Hexa core
Socket type
LGA 2011

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
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 95W 95W
Annual home energy cost 22.89 $/year 22.89 $/year
Annual commercial energy cost 83.22 $/year 83.22 $/year
Typical power consumption 77.19W 77.19W

bus

Architecture QPI QPI
Number of links 2 2
Data rate 64,000 MB/s 57,600 MB/s
Transfer rate 8,000 MT/s 7,200 MT/s
Clock speed 4,000 MHz 3,600 MHz

details

Xeon E5 4650 v2  vs
E5-2640 
Architecture x86-64 x86-64
Threads 20 12
L3 cache 25 MB 15 MB
Manufacture process 22 nm 32 nm
Max CPUs 4 2
Clock multiplier 24 30
Voltage range 0.65 - 1.3V 0.6 - 1.35V
Operating temperature Unknown - 75°C Unknown - 73°C

overclocking

Overclocked clock speed 2.4 GHz 2.9 GHz
Overclocked clock speed (Water) 2.4 GHz 2.5 GHz
Overclocked clock speed (Air) 2.4 GHz 2.9 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

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Quad Channel Quad Channel
Supports ECC Yes Yes
Maximum bandwidth 59,733.32 MB/s 42,666.64 MB/s
Maximum memory size 786,432 MB 393,216 MB
Intel Xeon E5 4650 v2
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Intel Xeon E5-2640
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