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Differences What are the advantages of each

Front view of Intel Pentium D 915

Reasons to consider the
Intel Pentium D 915

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Better overclocked clock speed (Water) 4.43 GHz vs 4.23 GHz Around 5% 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 better PassMark score 2,160 vs 584 Around 3.8x better PassMark score
Much better PassMark (Single core) score 1,251 vs 649 Around 95% better PassMark (Single core) score
Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 1.83 pt/W vs 0.51 pt/W More than 3.5x better performance per watt
Higher clock speed 3 GHz vs 2.8 GHz More than 5% higher clock speed
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
Much lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Much higher Maximum operating temperature 72.4 °C vs 63.4 °C Around 15% higher Maximum operating temperature
Much better overclocked clock speed (Air) 4.22 GHz vs 3.92 GHz Around 10% better overclocked clock speed (Air)
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost
Newer Jan, 2008 vs Jul, 2006 Release date over 1 years later

Benchmarks Real world tests of Pentium D 915 vs Core2 Duo E8400

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Pentium D 915  vs
Core2 Duo E8400 
Clock speed 2.8 GHz 3 GHz
Cores Dual 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 95W 65W
Annual home energy cost 22.89 $/year 15.66 $/year
Annual commercial energy cost 83.22 $/year 56.94 $/year
Performance per watt 0.51 pt/W 1.83 pt/W
Typical power consumption 77.19W 52.81W

bus

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

details

Pentium D 915  vs
Core2 Duo E8400 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 4 MB 6 MB
L2 cache per core 2 MB/core 3 MB/core
Manufacture process 65 nm 45 nm
Transistor count 376,000,000 410,000,000
Max CPUs 1 1
Clock multiplier 14 9
Voltage range 1.2 - 1.34V 0.85 - 1.36V
Operating temperature Unknown - 63.4°C Unknown - 72.4°C

overclocking

Overclocked clock speed 3.92 GHz 4.22 GHz
Overclocked clock speed (Water) 4.43 GHz 4.23 GHz
Overclocked clock speed (Air) 3.92 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 D 915
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Intel Core2 Duo E8400
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