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Differences What are the advantages of each

Front view of Intel Pentium 955

Reasons to consider the
Intel Pentium 955

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Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Front view of Intel Pentium 840

Reasons to consider the
Intel Pentium 840

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Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed

Benchmarks Real world tests of Pentium 955 vs 840

GeekBench (32-bit) Data courtesy Primate Labs

Pentium 955
2,667
Pentium 840
1,504

GeekBench

Pentium 955
2,667
Pentium 840
2,521

Specifications Full list of technical specs

summary

Pentium 955  vs
840 
Clock speed 3.46 GHz 3.2 GHz
Cores Dual core Dual core
Socket type
LGA 775
Is unlocked Yes Yes

features

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

power consumption

TDP 130W 130W
Annual home energy cost 31.32 $/year 31.32 $/year
Annual commercial energy cost 113.88 $/year 113.88 $/year
Performance per watt 0.49 pt/W 0.78 pt/W
Typical power consumption 105.63W 105.63W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 1,066 MHz 800 MHz

details

Pentium 955  vs
840 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 4 MB 2 MB
L2 cache per core 2 MB/core 1 MB/core
Manufacture process 65 nm 90 nm
Transistor count 376,000,000 230,000,000
Max CPUs 1 1
Clock multiplier 13 16
Voltage range 1.2 - 1.34V 1.2 - 1.4V
Operating temperature Unknown - 68.6°C Unknown - 69.8°C

overclocking

Overclocked clock speed 4.39 GHz 4.29 GHz
Overclocked clock speed (Water) 4.61 GHz 3.2 GHz
Overclocked clock speed (Air) 4.39 GHz 4.29 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 No No
Intel Pentium 955
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Intel Pentium 840
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