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Differences What are the advantages of each

Front view of Intel Xeon L5640

Reasons to consider the
Intel Xeon L5640

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Higher clock speed 2.26 GHz vs 2.13 GHz More than 5% higher clock speed
Much better overclocked clock speed (Air) 3.9 GHz vs 3.46 GHz Around 15% better overclocked clock speed (Air)
Better overclocked clock speed (Water) 2.27 GHz vs 2.13 GHz More than 5% better overclocked clock speed (Water)
Front view of Intel Xeon L5639

Reasons to consider the
Intel Xeon L5639

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Much better performance per dollar 2.23 pt/$ vs 0.63 pt/$ More than 3.5x better performance per dollar

Benchmarks Real world tests of Xeon L5640 vs L5639

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon L5640
16,852
Xeon L5639
14,645

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon L5640
1,918
Xeon L5639
2,085

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon L5640
1,250,000 MB/s
Xeon L5639
1,390,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon L5640
11,047
Xeon L5639
9,881

GeekBench

Xeon L5640
11,047
Xeon L5639
13,956

PassMark Data courtesy Passmark

Xeon L5640
6,451
Xeon L5639
7,021

PassMark (Single Core)

Xeon L5640
1,100
Xeon L5639
1,125

Specifications Full list of technical specs

summary

Xeon L5640  vs
L5639 
Clock speed 2.26 GHz 2.13 GHz
Cores Hexa core Hexa core
Socket type
LGA 1366

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

bus

Architecture QPI QPI
Number of links 2 2
Data rate 46,928 MB/s 46,928 MB/s
Transfer rate 5,860 MT/s 5,860 MT/s
Clock speed 2,930 MHz 2,933 MHz

details

Xeon L5640  vs
L5639 
Threads 12 12
L2 cache 2 MB 2 MB
L2 cache per core 0.33 MB/core 0.33 MB/core
L3 cache 12 MB 12 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 2

overclocking

Overclocked clock speed 3.9 GHz 3.46 GHz
Overclocked clock speed (Water) 2.27 GHz 2.13 GHz
Overclocked clock speed (Air) 3.9 GHz 3.46 GHz

power consumption

TDP 60W 60W
Annual home energy cost 14.45 $/year 14.45 $/year
Annual commercial energy cost 52.56 $/year 52.56 $/year
Performance per watt 10.46 pt/W 11.16 pt/W
Typical power consumption 48.75W 48.75W
Intel Xeon L5640
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Intel Xeon L5639
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