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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 1.9 GHz More than 35% higher clock speed
Much more l3 cache 20 MB vs 15 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
Much better PassMark (Single core) score 2,091 vs 1,355 Around 55% better PassMark (Single core) score
More threads 16 vs 12 4 more threads
Front view of Intel Xeon E5-2420

Reasons to consider the
Intel Xeon E5-2420

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Lower typical power consumption 77.19W vs 93.44W More than 15% lower typical power consumption
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Lower annual commercial energy cost 83.22 $/year vs 100.74 $/year More than 15% lower annual commercial energy cost
Lower annual home energy cost 22.89 $/year vs 27.7 $/year More than 15% lower annual home energy cost

Benchmarks Real world tests of Xeon E5-2689 vs E5-2420

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5-2689
36,294
Xeon E5-2420
10,344

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 E5-2420
985,150 MB/s

PassMark Data courtesy Passmark

Xeon E5-2689
19,521
Xeon E5-2420
8,570

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E5-2689  vs
E5-2420 
Clock speed 2.6 GHz 1.9 GHz
Cores Octa core Hexa core

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

details

Xeon E5-2689  vs
E5-2420 
Threads 16 12
L2 cache 2 MB 2 MB
L2 cache per core 0.25 MB/core 0.33 MB/core
L3 cache 20 MB 15 MB
L3 cache per core 2.5 MB/core 2.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 2

power consumption

TDP 115W 95W
Annual home energy cost 27.7 $/year 22.89 $/year
Annual commercial energy cost 100.74 $/year 83.22 $/year
Performance per watt 10.97 pt/W 5.47 pt/W
Typical power consumption 93.44W 77.19W

bus

Architecture QPI QPI
Number of links 2 1
Data rate 64,000 MB/s 28,800 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 E5-2420
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