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Differences What are the advantages of each

Front view of Intel Pentium D 945

Reasons to consider the
Intel Pentium D 945

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Much more l2 cache 4 MB vs 2 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 3.4 GHz vs 2 GHz 70% higher clock speed
Much newer manufacturing process 65 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
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Air) 4.22 GHz vs 2.35 GHz Around 80% better overclocked clock speed (Air)
Newer Jul, 2006 vs May, 2004 Release date over 2 years later
Much better overclocked clock speed (Water) 4.59 GHz vs 2 GHz More than 2.2x better overclocked clock speed (Water)
More cores 2 vs 1 Twice as many cores; run more applications at once
Front view of Intel Pentium 755

Reasons to consider the
Intel Pentium 755

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Much lower typical power consumption 6.09W vs 77.19W 12.7x lower typical power consumption
Much lower annual home energy cost 1.81 $/year vs 22.89 $/year 12.7x lower annual home energy cost
Much lower annual commercial energy cost 6.57 $/year vs 83.22 $/year 12.7x lower annual commercial energy cost

Features Key features of the Pentium D 945  vs 755 

clock speed

Pentium D 945
3.4 GHz
Pentium 755
2 GHz

L2 cache

overclocked clock speed (air)

Pentium D 945
4.22 GHz
Pentium 755
2.35 GHz

overclocked clock speed (water)

Pentium D 945
4.59 GHz
Pentium 755
2 GHz

TDP

Specifications Full list of technical specs

summary

Pentium D 945  vs
755 
Clock speed 3.4 GHz 2 GHz
Cores Dual core Single core
Socket type
LGA 775
479

features

Has a NX bit Yes No
Supports trusted computing No No
Has virtualization support No No
Instruction set extensions
MMX
SSE
SSE2
SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 7.5W
Annual home energy cost 22.89 $/year 1.81 $/year
Annual commercial energy cost 83.22 $/year 6.57 $/year
Typical power consumption 77.19W 6.09W

memory controller

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

details

Pentium D 945  vs
755 
Architecture x86-64 x86
Threads 2 1
L2 cache 4 MB 2 MB
L2 cache per core 2 MB/core 2 MB/core
Manufacture process 65 nm 90 nm
Transistor count 376,000,000 144,000,000
Max CPUs 1 1
Clock multiplier 17 20
Voltage range 1.2 - 1.34V 0.99 - 1.34V

overclocking

Overclocked clock speed 4.22 GHz 2.35 GHz
Overclocked clock speed (Water) 4.59 GHz 2 GHz
Overclocked clock speed (Air) 4.22 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

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 800 MHz 400 MHz
Intel Pentium D 945
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Intel Pentium 755
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