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Differences What are the advantages of each

Front view of Intel Xeon E5420

Reasons to consider the
Intel Xeon E5420

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Much more l2 cache 12 MB vs 4 MB 3x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 2.5 GHz vs 1.86 GHz Around 35% higher clock speed
More cores 4 vs 2 Twice as many cores; run more applications at once
Much more l2 cache per core 3 MB/core vs 2 MB/core 50% more l2 cache per core
Much better overclocked clock speed (Air) 3.19 GHz vs 2.2 GHz More than 45% better overclocked clock speed (Air)
Newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More threads 4 vs 2 Twice as many threads
Much better overclocked clock speed (Water) 3.94 GHz vs 2.2 GHz Around 80% better overclocked clock speed (Water)
Newer Nov, 2007 vs Jun, 2006 Release date over 1 years later
Front view of Intel Xeon 5120

Reasons to consider the
Intel Xeon 5120

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Lower typical power consumption 52.81W vs 65W Around 20% lower typical power consumption
Lower annual commercial energy cost 56.94 $/year vs 70.08 $/year Around 20% lower annual commercial energy cost
Lower annual home energy cost 15.66 $/year vs 19.27 $/year Around 20% lower annual home energy cost

Benchmarks Real world tests of Xeon E5420 vs 5120

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon E5420
5,821
Xeon 5120
3,487

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon E5420
1,317
Xeon 5120
1,011

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5420
106,200 MB/s
Xeon 5120
96.45 MB/s

PassMark Data courtesy Passmark

Xeon E5420
3,534
Xeon 5120
1,249

PassMark (Single Core)

Xeon E5420
1,073
Xeon 5120
723

Specifications Full list of technical specs

summary

Xeon E5420  vs
5120 
Clock speed 2.5 GHz 1.86 GHz
Cores Quad core Dual core
Socket type
LGA 771

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
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 65W
Annual home energy cost 19.27 $/year 15.66 $/year
Annual commercial energy cost 70.08 $/year 56.94 $/year
Performance per watt 1.78 pt/W 0.95 pt/W
Typical power consumption 65W 52.81W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 1,333 MHz 1,066 MHz

details

Xeon E5420  vs
5120 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 12 MB 4 MB
L2 cache per core 3 MB/core 2 MB/core
Manufacture process 45 nm 65 nm
Transistor count 820,000,000 291,000,000
Max CPUs 2 2
Clock multiplier 7 7
Voltage range 0.85 - 1.35V 1 - 1.5V
Operating temperature Unknown - 67°C Unknown - 65°C

overclocking

Overclocked clock speed 3.19 GHz 2.2 GHz
Overclocked clock speed (Water) 3.94 GHz 2.2 GHz
Overclocked clock speed (Air) 3.19 GHz 2.2 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
Intel Xeon E5420
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Intel Xeon 5120
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