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Differences What are the advantages of each

Front view of Intel Xeon E5-2689

Reasons to consider the
Intel Xeon E5-2689

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Much higher clock speed 2.6 GHz vs 1.7 GHz Around 55% higher clock speed
Much better performance per watt 10.97 pt/W vs 3.56 pt/W More than 3x better performance per watt
Front view of Intel Xeon E5 2650L v2

Reasons to consider the
Intel Xeon E5 2650L 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
More l2 cache 2.5 MB vs 2 MB 25% more l2 cache; more data can be stored in the l2 cache for quick access later
More threads 20 vs 16 4 more threads
Much lower typical power consumption 56.88W vs 93.44W Around 40% lower typical power consumption
Newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower annual commercial energy cost 61.32 $/year vs 100.74 $/year Around 40% lower annual commercial energy cost
Much lower annual home energy cost 16.86 $/year vs 27.7 $/year Around 40% lower annual home energy cost
Newer Jul, 2013 vs Mar, 2012 Release date over 1 years later

Benchmarks Real world tests of Xeon E5-2689 vs E5 2650L v2

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 E5-2689
2,360,000 MB/s
Xeon E5 2650L v2
90,100 MB/s

Specifications Full list of technical specs

summary

Xeon E5-2689  vs
E5 2650L v2 
Clock speed 2.6 GHz 1.7 GHz
Cores Octa core Deca 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
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

details

Xeon E5-2689  vs
E5 2650L v2 
Threads 16 20
L2 cache 2 MB 2.5 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 20 MB 25 MB
L3 cache per core 2.5 MB/core 2.5 MB/core
Manufacture process 32 nm 22 nm
Max CPUs 2 2

power consumption

TDP 115W 70W
Annual home energy cost 27.7 $/year 16.86 $/year
Annual commercial energy cost 100.74 $/year 61.32 $/year
Performance per watt 10.97 pt/W 3.56 pt/W
Typical power consumption 93.44W 56.88W

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
Intel Xeon E5-2689
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Intel Xeon E5 2650L v2
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