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Differences What are the advantages of each

Front view of Intel Xeon E5-4640 v2

Reasons to consider the
Intel Xeon E5-4640 v2

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Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Newer Jan, 2014 vs Jul, 2013 Release date 6 months later
Front view of Intel Xeon E5 2660 v2

Reasons to consider the
Intel Xeon E5 2660 v2

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Much more l3 cache 25 MB vs 20 MB 25% more l3 cache; more data can be stored in the l3 cache for quick access later
Higher turbo clock speed 3 GHz vs 2.7 GHz More than 10% higher turbo clock speed

Features Key features of the Xeon E5-4640 v2  vs E5 2660 v2 

clock speed

turbo clock speed

Specifications Full list of technical specs

summary

Xeon E5-4640 v2  vs
E5 2660 v2 
Clock speed 2.2 GHz 2.2 GHz
Turbo clock speed 2.7 GHz 3 GHz
Cores Deca core Dodeca 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

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 No
Maximum bandwidth 59,733.32 MB/s 25,600 MB/s
Maximum memory size 786,432 MB 786,432 MB

details

Xeon E5-4640 v2  vs
E5 2660 v2 
Architecture x86-64 x86-64
Threads 20 20
L3 cache 20 MB 25 MB
Manufacture process 22 nm 22 nm
Max CPUs 4 2
Operating temperature Unknown - 75°C Unknown - 75°C

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

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 64,000 MB/s
Transfer rate 8,000 MT/s 8,000 MT/s
Clock speed 4,000 MHz 4,000 MHz
Intel Xeon E5-4640 v2
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Intel Xeon E5 2660 v2
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