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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 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More advanced architecture x86-64 vs x86 A 64-bit architecture allows more RAM to be installed and accessed by the processor
Higher clock speed 2.4 GHz vs 2 GHz Around 20% higher clock speed
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
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 2.35 GHz More than 60% better overclocked clock speed (Air)
More threads 8 vs 1 7 more threads
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
More cores 4 vs 1 3 more cores; run more applications at once
Newer Mar, 2010 vs May, 2004 Release date over 5 years later
Much better overclocked clock speed (Water) 4.33 GHz vs 2 GHz Around 2.2x better overclocked clock speed (Water)
Front view of Intel Pentium 755

Reasons to consider the
Intel Pentium 755

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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 lower typical power consumption 6.09W vs 65W 10.7x lower typical power consumption
Much more l2 cache per core 2 MB/core vs 0.25 MB/core 8x more l2 cache per core
Much lower annual home energy cost 1.81 $/year vs 19.27 $/year 10.7x lower annual home energy cost
Much lower annual commercial energy cost 6.57 $/year vs 70.08 $/year 10.7x lower annual commercial energy cost

Features Key features of the Xeon E5620  vs Pentium 755 

clock speed

Xeon E5620
2.4 GHz
Pentium 755
2 GHz

L2 cache

overclocked clock speed (air)

Xeon E5620
3.75 GHz
Pentium 755
2.35 GHz

overclocked clock speed (water)

Xeon E5620
4.33 GHz
Pentium 755
2 GHz

TDP

Specifications Full list of technical specs

summary

Xeon E5620  vs
Pentium 755 
Clock speed 2.4 GHz 2 GHz
Cores Quad core Single core
Socket type
LGA 1366
479

features

Has a NX bit Yes No
Supports trusted computing Yes No
Has virtualization support Yes No
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 7.5W
Annual home energy cost 19.27 $/year 1.81 $/year
Annual commercial energy cost 70.08 $/year 6.57 $/year
Typical power consumption 65W 6.09W

bus

Architecture QPI FSB
Number of links 2 1
Clock speed 2,930 MHz 400 MHz

details

Xeon E5620  vs
Pentium 755 
Architecture x86-64 x86
Threads 8 1
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 2 MB/core
Manufacture process 32 nm 90 nm
Max CPUs 2 1
Clock multiplier 18 20
Voltage range 0.75 - 1.35V 0.99 - 1.34V

overclocking

Overclocked clock speed 3.75 GHz 2.35 GHz
Overclocked clock speed (Water) 4.33 GHz 2 GHz
Overclocked clock speed (Air) 3.75 GHz 2.35 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

memory controller

Memory controller Built-in Built-in
Supports ECC Yes No
Intel Xeon E5620
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Intel Pentium 755
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