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Intel Pentium 4 521

Front view of Intel Pentium 4 521
Front view of AMD Sempron 3400+

AMD Sempron 3400+

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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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Significantly higher clock speed 2.8 GHz vs 1.8 GHz More than 55% higher clock speed
Significantly more l2 cache 1 MB vs 0 MB Compared to all cpus, 1 MB l2 cache is just OK
Much more l2 cache per core 1 MB/core vs 0 MB/core Compared to all cpus, 1 MB/core l2 cache per core is just OK
Significantly better overclocked clock speed (Air) 3.72 GHz vs 2.44 GHz More than 50% better overclocked clock speed (Air)
Higher Maximum operating temperature 67.7 °C vs 55 °C Around 25% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.28 GHz vs 2 GHz Around 2.2x better overclocked clock speed (Water)
Front view of AMD Sempron 3400+

Reasons to consider the
AMD Sempron 3400+

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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
Lower typical power consumption 50.38W vs 68.25W More than 25% lower typical power consumption
Newer May, 2006 vs Jul, 2005 Release date 10 months later
Lower annual commercial energy cost 54.31 $/year vs 73.58 $/year More than 25% lower annual commercial energy cost
Lower annual home energy cost 14.94 $/year vs 20.24 $/year More than 25% lower annual home energy cost

Features Key features of the Pentium 4 521  vs Sempron 3400+ 

clock speed

Pentium 4 521
2.8 GHz
Sempron 3400+
1.8 GHz

L2 cache

Pentium 4 521
1 MB
Sempron 3400+
0 MB

overclocked clock speed (air)

Pentium 4 521
3.72 GHz
Sempron 3400+
2.44 GHz

overclocked clock speed (water)

Pentium 4 521
4.28 GHz
Sempron 3400+
2 GHz

TDP

Pentium 4 521
84W
Sempron 3400+
62W

Specifications Full list of technical specs

summary

 Pentium 4 521  vs
Sempron 3400+ 
Clock speed 2.8 GHz 1.8 GHz
Cores Single core Single core
Socket type
LGA 775
AM2
754
939

features
Has a NX bit Yes Yes
Has virtualization support No No
Instruction set extensions
SSE2
MMX
SSE3
SSE
3DNow!
Supports dynamic frequency scaling No Yes

power consumption
TDP 84W 62W
Annual home energy cost 20.24 $/year 14.94 $/year
Annual commercial energy cost 73.58 $/year 54.31 $/year
Typical power consumption 68.25W 50.38W

bus
Clock speed 800 MHz 200 MHz

details

 Pentium 4 521  vs
Sempron 3400+ 
Architecture x86-64 x86-64
Threads 2 1
L2 cache 1 MB 0 MB
L2 cache per core 1 MB/core 0 MB/core
Manufacture process 90 nm 90 nm
Max CPUs 1 1
Operating temperature Unknown - 67.7°C Unknown - 55°C

overclocking
Overclocked clock speed 3.72 GHz 2.44 GHz
Overclocked clock speed (Water) 4.28 GHz 2 GHz
PassMark (Overclocked) 713.8 1,043.3
Overclocked clock speed (Air) 3.72 GHz 2.44 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 4 521
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AMD Sempron 3400+
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