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Differences What are the advantages of each

Front view of AMD Sempron 2100+

Reasons to consider the
AMD Sempron 2100+

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Much better geekbench 3 AES single core score 58,900 MB/s vs 59.9 MB/s More than 983.2x better geekbench 3 AES single core score
Much newer manufacturing process 65 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 6.5W vs 72.31W 11.1x lower typical power consumption
Much higher Maximum operating temperature 95 °C vs 49 °C Around 95% higher Maximum operating temperature
Much better performance per watt 6.69 pt/W vs 0.52 pt/W Around 12.8x better performance per watt
Much lower annual home energy cost 1.93 $/year vs 21.44 $/year 11.1x lower annual home energy cost
Much lower annual commercial energy cost 7.01 $/year vs 77.96 $/year 11.1x lower annual commercial energy cost
Front view of AMD Athlon X2 4200+

Reasons to consider the
AMD Athlon X2 4200+

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Significantly higher clock speed 2.2 GHz vs 1 GHz Around 2.2x higher clock speed
Significantly 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 better overclocked clock speed (Air) 2.65 GHz vs 1 GHz Around 2.8x better overclocked clock speed (Air)
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
More cores 2 vs 1 Twice as many cores; run more applications at once
Much better overclocked clock speed (Water) 2.9 GHz vs 1 GHz Around 3x better overclocked clock speed (Water)

Benchmarks Real world tests of Sempron 2100+ vs Athlon X2 4200+

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 2100+
58,900 MB/s
Athlon X2 4200+
59.9 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Sempron 2100+  vs
Athlon X2 4200+ 
Clock speed 1 GHz 2.2 GHz
Cores Single core Dual core

features

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

details

Sempron 2100+  vs
Athlon X2 4200+ 
Threads 1 2
L2 cache 0.25 MB 1 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 65 nm 90 nm
Max CPUs 1 1
Operating temperature Unknown - 95°C Unknown - 49°C

overclocking

Overclocked clock speed 1 GHz 2.65 GHz
Overclocked clock speed (Water) 1 GHz 2.9 GHz
PassMark (Overclocked) 1,478.1 948.2
Overclocked clock speed (Air) 1 GHz 2.65 GHz

power consumption

TDP 8W 89W
Annual home energy cost 1.93 $/year 21.44 $/year
Annual commercial energy cost 7.01 $/year 77.96 $/year
Performance per watt 6.69 pt/W 0.52 pt/W
Typical power consumption 6.5W 72.31W
AMD Sempron 2100+
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AMD Athlon X2 4200+
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