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Differences What are the advantages of each

Front view of Intel Pentium D 805

Reasons to consider the
Intel Pentium D 805

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Much more l2 cache 2 MB vs 0.5 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Much newer manufacturing process 90 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly higher clock speed 2.66 GHz vs 2.1 GHz More than 25% higher clock speed
More cores 2 vs 1 Twice as many cores; run more applications at once
More threads 2 vs 1 Twice as many threads
Much better overclocked clock speed (Air) 3.5 GHz vs 2.47 GHz More than 40% better overclocked clock speed (Air)
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Front view of AMD Athlon XP 3000+

Reasons to consider the
AMD Athlon XP 3000+

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Slightly better overclocked clock speed (Water) 2.74 GHz vs 2.66 GHz Around 5% better overclocked clock speed (Water)

Benchmarks Real world tests of Pentium D 805 vs Athlon XP 3000+

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Pentium D 805  vs
Athlon XP 3000+ 
Clock speed 2.66 GHz 2.1 GHz
Cores Dual core Single core
Socket type
LGA 775
462

features

Has a NX bit Yes No
Instruction set extensions
SSE2
MMX
SSE3
SSE
3DNow!

bus

Clock speed 533 MHz 400 MHz

details

Pentium D 805  vs
Athlon XP 3000+ 
Threads 2 1
L2 cache 2 MB 0.5 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 90 nm 130 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.5 GHz 2.47 GHz
Overclocked clock speed (Water) 2.66 GHz 2.74 GHz
PassMark (Overclocked) 883.9 337.6
Overclocked clock speed (Air) 3.5 GHz 2.47 GHz

power consumption

Typical power consumption 77.19W N/A
Intel Pentium D 805
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AMD Athlon XP 3000+
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