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Differences What are the advantages of each

Front view of AMD Sempron X2 2100

Reasons to consider the
AMD Sempron X2 2100

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Much newer manufacturing process 65 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly better overclocked clock speed (Air) 2.95 GHz vs 2.75 GHz Around 10% better overclocked clock speed (Air)
Front view of AMD Athlon 64 X2 4400+

Reasons to consider the
AMD Athlon 64 X2 4400+

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Significantly higher clock speed 2.3 GHz vs 1.8 GHz Around 30% higher clock speed
Much better overclocked clock speed (Water) 3.13 GHz vs 1.8 GHz Around 75% better overclocked clock speed (Water)

Benchmarks Real world tests of Sempron X2 2100 vs Athlon 64 X2 4400+

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Sempron X2 2100
49.8 MB/s
Athlon 64 X2 4400+
85.5 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Sempron X2 2100  vs
Athlon 64 X2 4400+ 
Clock speed 1.8 GHz 2.3 GHz
Cores Dual core Dual core
Socket type
AM2
939

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
3DNow!

details

Sempron X2 2100  vs
Athlon 64 X2 4400+ 
Threads 2 2
L2 cache 1 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 65 nm 90 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.95 GHz 2.75 GHz
Overclocked clock speed (Water) 1.8 GHz 3.13 GHz
Overclocked clock speed (Air) 2.95 GHz 2.75 GHz

power consumption

TDP 65W 65W
Annual home energy cost 15.66 $/year 15.66 $/year
Annual commercial energy cost 56.94 $/year 56.94 $/year
Performance per watt 0.6 pt/W 0.89 pt/W
Typical power consumption 52.81W 52.81W
AMD Sempron X2 2100
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AMD Athlon 64 X2 4400+
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