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Differences What are the advantages of each

Front view of Intel Pentium 4 521

Reasons to consider the
Intel Pentium 4 521

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Much higher clock speed 2.8 GHz vs 1.53 GHz Around 85% higher clock speed
Much more l2 cache 1 MB vs 0.25 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
Much better overclocked clock speed (Air) 3.72 GHz vs 1.51 GHz Around 2.5x better overclocked clock speed (Air)
More threads 2 vs 1 Twice as many threads
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Water) 4.28 GHz vs 1.5 GHz More than 2.8x better overclocked clock speed (Water)
Front view of AMD Athlon XP 1800+

Reasons to consider the
AMD Athlon XP 1800+

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CPUBoss is not aware of any important advantages of the AMD Athlon XP 1800+ vs the Intel Pentium 4 521.

Features Key features of the Pentium 4 521  vs Athlon XP 1800+ 

clock speed

Pentium 4 521
2.8 GHz
Athlon XP 1800+
1.53 GHz

L2 cache

overclocked clock speed (air)

Pentium 4 521
3.72 GHz
Athlon XP 1800+
1.51 GHz

overclocked clock speed (water)

Pentium 4 521
4.28 GHz
Athlon XP 1800+
1.5 GHz

Specifications Full list of technical specs

summary

Pentium 4 521  vs
Athlon XP 1800+ 
Clock speed 2.8 GHz 1.53 GHz
Cores Single 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 800 MHz 266 MHz

details

Pentium 4 521  vs
Athlon XP 1800+ 
Threads 2 1
L2 cache 1 MB 0.25 MB
L2 cache per core 1 MB/core 0.25 MB/core
Manufacture process 90 nm 130 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.72 GHz 1.51 GHz
Overclocked clock speed (Water) 4.28 GHz 1.5 GHz
Overclocked clock speed (Air) 3.72 GHz 1.51 GHz

power consumption

Typical power consumption 68.25W N/A
Intel Pentium 4 521
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AMD Athlon XP 1800+
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