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Differences What are the advantages of each

Front view of Intel Xeon E5-2660 v3

Reasons to consider the
Intel Xeon E5-2660 v3

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Much higher clock speed 2.6 GHz vs 2.2 GHz Around 20% higher clock speed
Significantly higher turbo clock speed 3.3 GHz vs 2.9 GHz Around 15% higher turbo clock speed
Much better performance per watt 13.11 pt/W vs 1.47 pt/W Around 9x better performance per watt
Much better overclocked clock speed (Air) 2.6 GHz vs 2.2 GHz Around 20% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 2.6 GHz vs 2.2 GHz Around 20% better overclocked clock speed (Water)
Front view of Intel Xeon E5-2658A v3

Reasons to consider the
Intel Xeon E5-2658A v3

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Much more l3 cache 30 MB vs 25 MB 20% more l3 cache; more data can be stored in the l3 cache for quick access later
More threads 24 vs 20 4 more threads
Newer Jan, 2015 vs Jul, 2014 Release date 6 months later

Benchmarks Real world tests of Xeon E5-2660 v3 vs E5-2658A v3

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5-2660 v3
3,050,000 MB/s
Xeon E5-2658A v3
3,450 MB/s

Specifications Full list of technical specs

summary

Xeon E5-2660 v3  vs
E5-2658A v3 
Clock speed 2.6 GHz 2.2 GHz
Turbo clock speed 3.3 GHz 2.9 GHz
Cores Deca core Duodeca core

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
AES
AVX
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 105W 105W
Annual home energy cost 25.29 $/year 25.29 $/year
Annual commercial energy cost 91.98 $/year 91.98 $/year
Performance per watt 13.11 pt/W 1.47 pt/W
Typical power consumption 85.31W 85.31W

bus

Architecture QPI QPI
Number of links 2 2
Data rate 76,800 MB/s 76,800 MB/s
Transfer rate 9,600 MT/s 9,600 MT/s
Clock speed 4,800 MHz 4,800 MHz

details

Xeon E5-2660 v3  vs
E5-2658A v3 
Architecture x86-64 x86-64
Threads 20 24
L3 cache 25 MB 30 MB
L3 cache per core 2.5 MB/core 2.5 MB/core
Manufacture process 22 nm 22 nm
Max CPUs 2 2

overclocking

Overclocked clock speed 2.6 GHz 2.2 GHz
Overclocked clock speed (Water) 2.6 GHz 2.2 GHz
Overclocked clock speed (Air) 2.6 GHz 2.2 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

memory controller

Memory controller Built-in Built-in
Channels Quad Channel Quad Channel
Supports ECC Yes Yes
Maximum memory size 786,432 MB 786,432 MB
Intel Xeon E5-2660 v3
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Intel Xeon E5-2658A v3
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