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Differences What are the advantages of each

Front view of Intel Xeon E5620

Reasons to consider the
Intel Xeon E5620

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Much newer manufacturing process 32 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 2.4 GHz vs 2.13 GHz Around 15% higher clock speed
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much better overclocked clock speed (Air) 3.75 GHz vs 2.13 GHz More than 75% better overclocked clock speed (Air)
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
More threads 8 vs 2 6 more threads
More cores 4 vs 2 Twice as many cores; run more applications at once
Much better overclocked clock speed (Water) 4.33 GHz vs 2.13 GHz More than 2x better overclocked clock speed (Water)
Front view of Intel Core2 Duo E6405

Reasons to consider the
Intel Core2 Duo E6405

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Significantly more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Lower typical power consumption 52.81W vs 65W Around 20% lower typical power consumption
Lower annual home energy cost 15.66 $/year vs 19.27 $/year Around 20% lower annual home energy cost
Lower annual commercial energy cost 56.94 $/year vs 70.08 $/year Around 20% lower annual commercial energy cost

Features Key features of the Xeon E5620  vs Core2 Duo E6405 

clock speed

Xeon E5620
2.4 GHz
Core2 Duo E6405
2.13 GHz

L2 cache

overclocked clock speed (air)

Xeon E5620
3.75 GHz
Core2 Duo E6405
2.13 GHz

overclocked clock speed (water)

Xeon E5620
4.33 GHz
Core2 Duo E6405
2.13 GHz

Specifications Full list of technical specs

summary

Xeon E5620  vs
Core2 Duo E6405 
Clock speed 2.4 GHz 2.13 GHz
Cores Quad core Dual core
Socket type
LGA 1366
LGA 771

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
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

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
Typical power consumption 65W 52.81W

details

Xeon E5620  vs
Core2 Duo E6405 
Architecture x86-64 x86-64
Threads 8 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 32 nm 65 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 3.75 GHz 2.13 GHz
Overclocked clock speed (Water) 4.33 GHz 2.13 GHz
Overclocked clock speed (Air) 3.75 GHz 2.13 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 FSB
Number of links 2 1
Clock speed 2,930 MHz 1,066 MHz
Intel Xeon E5620
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Intel Core2 Duo E6405
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