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Differences What are the advantages of each

Front view of Intel Xeon L5420

Reasons to consider the
Intel Xeon L5420

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Much more l2 cache 12 MB vs 0.5 MB 24x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 3 MB/core vs 0.25 MB/core 12x more l2 cache per core
Much lower typical power consumption 40.63W vs 98.28W 2.4x lower typical power consumption
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
More cores 4 vs 2 Twice as many cores; run more applications at once
Much lower annual home energy cost 12.04 $/year vs 37.88 $/year 3.1x lower annual home energy cost
Better overclocked clock speed (Air) 3.67 GHz vs 3.23 GHz Around 15% better overclocked clock speed (Air)
Much lower annual commercial energy cost 43.8 $/year vs 93.47 $/year 2.1x lower annual commercial energy cost
Better performance per watt 2.75 pt/W vs 1.41 pt/W More than 95% better performance per watt
Better overclocked clock speed (Water) 3.85 GHz vs 3.23 GHz Around 20% better overclocked clock speed (Water)
Front view of Intel Core i3 2100

Reasons to consider the
Intel Core i3 2100

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Higher clock speed 3.1 GHz vs 2.5 GHz Around 25% higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per dollar 1.14 pt/$ vs 0.33 pt/$ Around 3.5x better performance per dollar
Better PassMark (Single core) score 1,583 vs 1,043 More than 50% better PassMark (Single core) score
Higher Maximum operating temperature 69.1 °C vs 57 °C More than 20% higher Maximum operating temperature
Newer Jan, 2011 vs Mar, 2008 Release date over 2 years later

Benchmarks Real world tests of Xeon L5420 vs Core i3 2100

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon L5420
4,968
Core i3 2100
4,786

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon L5420
1,380
Core i3 2100
2,258

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon L5420
107,200 MB/s
Core i3 2100
153,100 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon L5420
4,473
Core i3 2100
4,738

GeekBench (64-bit) Data courtesy Primate Labs

Xeon L5420
5,037
Core i3 2100
5,042

GeekBench

Xeon L5420
5,037
Core i3 2100
7,901

PassMark Data courtesy Passmark

Xeon L5420
3,506
Core i3 2100
3,664

PassMark (Single Core)

Xeon L5420
1,043
Core i3 2100
1,583

Specifications Full list of technical specs

summary

Xeon L5420  vs
Core i3 2100 
Clock speed 2.5 GHz 3.1 GHz
Cores Quad core Dual core
Socket type
LGA 771
LGA 1155

features

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

power consumption

TDP 50W 65W
Annual home energy cost 12.04 $/year 37.88 $/year
Annual commercial energy cost 43.8 $/year 93.47 $/year
Performance per watt 2.75 pt/W 1.41 pt/W
Typical power consumption 40.63W 98.28W

details

Xeon L5420  vs
Core i3 2100 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 12 MB 0.5 MB
L2 cache per core 3 MB/core 0.25 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 2 1
Clock multiplier 7 31
Operating temperature Unknown - 57°C Unknown - 69.1°C

overclocking

Overclocked clock speed 3.67 GHz 3.23 GHz
Overclocked clock speed (Water) 3.85 GHz 3.23 GHz
Overclocked clock speed (Air) 3.67 GHz 3.23 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 2000
Number of displays supported N/A 2
GPU clock speed N/A 850 MHz
Turbo clock speed N/A 1,100 MHz

bus

Architecture FSB DMI
Number of links 1 1
Intel Xeon L5420
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Intel Core i3 2100
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