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Differences What are the advantages of each

Front view of Intel Pentium 4 651

Reasons to consider the
Intel Pentium 4 651

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Significantly higher clock speed 3.4 GHz vs 3 GHz Around 15% higher clock speed
Much better overclocked clock speed (Air) 4.72 GHz vs 4.22 GHz More than 10% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 5.41 GHz vs 4.23 GHz Around 30% better overclocked clock speed (Water)
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More cores 2 vs 1 Twice as many cores; run more applications at once
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Significantly lower typical power consumption 52.81W vs 69.88W Around 25% lower typical power consumption
Significantly higher Maximum operating temperature 72.4 °C vs 69.2 °C Around 5% higher Maximum operating temperature
Significantly lower annual home energy cost 15.66 $/year vs 20.72 $/year Around 25% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 75.34 $/year Around 25% lower annual commercial energy cost
Newer Jan, 2008 vs Apr, 2006 Release date over 1 years later

Features Key features of the Pentium 4 651  vs Core2 Duo E8400 

clock speed

L2 cache

overclocked clock speed (air)

Pentium 4 651
4.72 GHz
Core2 Duo E8400
4.22 GHz

overclocked clock speed (water)

Pentium 4 651
5.41 GHz
Core2 Duo E8400
4.23 GHz

Specifications Full list of technical specs

summary

Pentium 4 651  vs
Core2 Duo E8400 
Clock speed 3.4 GHz 3 GHz
Cores Single core Dual core
Socket type
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
Has virtualization support No Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 86W 65W
Annual home energy cost 20.72 $/year 15.66 $/year
Annual commercial energy cost 75.34 $/year 56.94 $/year
Typical power consumption 69.88W 52.81W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 800 MHz 1,333 MHz

details

Pentium 4 651  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 2 MB 6 MB
L2 cache per core 2 MB/core 3 MB/core
Manufacture process 65 nm 45 nm
Transistor count 188,000,000 410,000,000
Max CPUs 1 1
Clock multiplier 17 9
Voltage range 1.2 - 1.34V 0.85 - 1.36V
Operating temperature Unknown - 69.2°C Unknown - 72.4°C

overclocking

Overclocked clock speed 4.72 GHz 4.22 GHz
Overclocked clock speed (Water) 5.41 GHz 4.23 GHz
Overclocked clock speed (Air) 4.72 GHz 4.22 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 Pentium 4 651
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Intel Core2 Duo E8400
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