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Differences What are the advantages of each

Front view of Intel Xeon X5355

Reasons to consider the
Intel Xeon X5355

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Much more l2 cache 8 MB vs 1 MB 8x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 2.66 GHz vs 2.26 GHz Around 20% higher clock speed
Much more l2 cache per core 2 MB/core vs 0.25 MB/core 8x more l2 cache per core
Front view of Intel Xeon L5520

Reasons to consider the
Intel Xeon L5520

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Much lower typical power consumption 48.75W vs 97.5W 2x lower typical power consumption
More threads 8 vs 4 Twice as many threads
Newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Water) 4.08 GHz vs 2.66 GHz Around 55% better overclocked clock speed (Water)
Better overclocked clock speed (Air) 3.42 GHz vs 3.24 GHz More than 5% better overclocked clock speed (Air)
Much lower annual commercial energy cost 52.56 $/year vs 105.12 $/year 2x lower annual commercial energy cost
Much lower annual home energy cost 14.45 $/year vs 28.91 $/year 2x lower annual home energy cost
Newer Mar, 2009 vs Nov, 2006 Release date over 2 years later

Benchmarks Real world tests of Xeon X5355 vs L5520

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon X5355
9,667
Xeon L5520
6,798

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon X5355
1,408
Xeon L5520
1,624

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon X5355
108,000 MB/s
Xeon L5520
108,400 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon X5355
4,430
Xeon L5520
6,516

GeekBench

Xeon X5355
4,430
Xeon L5520
7,962

PassMark Data courtesy Passmark

Xeon X5355
3,266
Xeon L5520
4,387

PassMark (Single Core)

Xeon X5355
1,045
Xeon L5520
1,034

Specifications Full list of technical specs

summary

Xeon X5355  vs
L5520 
Clock speed 2.66 GHz 2.26 GHz
Cores Quad core Quad core
Socket type
LGA 771
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 120W 60W
Annual home energy cost 28.91 $/year 14.45 $/year
Annual commercial energy cost 105.12 $/year 52.56 $/year
Performance per watt 1.37 pt/W 2.66 pt/W
Typical power consumption 97.5W 48.75W

memory controller

Memory controller Built-in Built-in
Supports ECC No Yes

details

Xeon X5355  vs
L5520 
Architecture x86-64 x86-64
Threads 4 8
L2 cache 8 MB 1 MB
L2 cache per core 2 MB/core 0.25 MB/core
Manufacture process 65 nm 45 nm
Transistor count 582,000,000 731,000,000
Max CPUs 2 2
Clock multiplier 8 17
Voltage range 1 - 1.5V 0.75 - 1.35V
Operating temperature Unknown - 70°C Unknown - 70°C

overclocking

Overclocked clock speed 3.24 GHz 3.42 GHz
Overclocked clock speed (Water) 2.66 GHz 4.08 GHz
Overclocked clock speed (Air) 3.24 GHz 3.42 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 FSB QPI
Number of links 1 2
Clock speed 1,333 MHz 2,930 MHz
Intel Xeon X5355
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Intel Xeon L5520
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