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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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Significantly better overclocked clock speed (Air) 2.95 GHz vs 2.77 GHz More than 5% better overclocked clock speed (Air)
Front view of AMD Athlon X2 4000+

Reasons to consider the
AMD Athlon X2 4000+

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Higher clock speed 2.1 GHz vs 1.8 GHz More than 15% higher clock speed
Much better overclocked clock speed (Water) 3.24 GHz vs 1.8 GHz Around 80% better overclocked clock speed (Water)

Benchmarks Real world tests of Sempron X2 2100 vs Athlon X2 4000+

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 X2 4000+
62.3 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Sempron X2 2100  vs
Athlon X2 4000+ 
Clock speed 1.8 GHz 2.1 GHz
Cores Dual core Dual core
Socket type
AM2

features

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

details

Sempron X2 2100  vs
Athlon X2 4000+ 
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 65 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.95 GHz 2.77 GHz
Overclocked clock speed (Water) 1.8 GHz 3.24 GHz
Overclocked clock speed (Air) 2.95 GHz 2.77 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 0.73 pt/W
Typical power consumption 52.81W 52.81W
AMD Sempron X2 2100
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AMD Athlon X2 4000+
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