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Differences What are the advantages of each

Front view of Intel Xeon L5520

Reasons to consider the
Intel Xeon L5520

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Lower typical power consumption 48.75W vs 65W 25% lower typical power consumption
Lower annual commercial energy cost 52.56 $/year vs 70.08 $/year Around 25% lower annual commercial energy cost
Lower annual home energy cost 14.45 $/year vs 19.27 $/year Around 25% lower annual home energy cost
Front view of Intel Xeon E5540

Reasons to consider the
Intel Xeon E5540

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Significantly higher clock speed 2.53 GHz vs 2.26 GHz More than 10% higher clock speed
Higher turbo clock speed 2.8 GHz vs 2.48 GHz Around 15% higher turbo clock speed
Better overclocked clock speed (Air) 3.57 GHz vs 3.42 GHz Around 5% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.45 GHz vs 4.08 GHz Around 10% better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon L5520 vs E5540

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon L5520
6,798
Xeon E5540
8,617

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon L5520
1,624
Xeon E5540
1,679

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon L5520
108,400 MB/s
Xeon E5540
112,700 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon L5520
6,516
Xeon E5540
7,362

GeekBench

Xeon L5520
7,962
Xeon E5540
8,085

PassMark Data courtesy Passmark

Xeon L5520
4,387
Xeon E5540
4,857

PassMark (Single Core)

Xeon L5520
1,034
Xeon E5540
1,141

Specifications Full list of technical specs

summary

Xeon L5520  vs
E5540 
Clock speed 2.26 GHz 2.53 GHz
Turbo clock speed 2.48 GHz 2.8 GHz
Cores Quad core Quad core
Socket type
LGA 1366

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 60W 80W
Annual home energy cost 14.45 $/year 19.27 $/year
Annual commercial energy cost 52.56 $/year 70.08 $/year
Performance per watt 2.66 pt/W 2.24 pt/W
Typical power consumption 48.75W 65W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Triple Channel
Supports ECC Yes Yes
Maximum bandwidth 25,599.99 MB/s 25,599.99 MB/s
Maximum memory size 147,456 MB 147,456 MB

details

Xeon L5520  vs
E5540 
Architecture x86-64 x86-64
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 45 nm
Transistor count 731,000,000 731,000,000
Max CPUs 2 2
Clock multiplier 17 19
Voltage range 0.75 - 1.35V 0.75 - 1.35V
Operating temperature Unknown - 70°C Unknown - 76°C

overclocking

Overclocked clock speed 3.42 GHz 3.57 GHz
Overclocked clock speed (Water) 4.08 GHz 4.45 GHz
Overclocked clock speed (Air) 3.42 GHz 3.57 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

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 2,930 MHz
Intel Xeon L5520
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Intel Xeon E5540
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