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Differences What are the advantages of each

Front view of Intel Celeron B820

Reasons to consider the
Intel Celeron B820

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Much better geekbench 3 AES single core score 84,100 MB/s vs 38.7 MB/s Around 2173.2x better geekbench 3 AES single core score
Much newer manufacturing process 32 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
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
Significantly lower typical power consumption 28.44W vs 47.94W More than 40% lower typical power consumption
Much higher Maximum operating temperature 100 °C vs 69 °C Around 45% higher Maximum operating temperature
Newer Jul, 2012 vs Jul, 2004 Release date over 8 years later
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Better performance per watt 2.58 pt/W vs 0.41 pt/W Around 6.2x better performance per watt
More cores 2 vs 1 Twice as many cores; run more applications at once
Slightly better PassMark score 1,435 vs 340 Around 4.2x better PassMark score
Significantly lower annual home energy cost 8.43 $/year vs 14.21 $/year More than 40% lower annual home energy cost
Significantly lower annual commercial energy cost 30.66 $/year vs 51.68 $/year More than 40% lower annual commercial energy cost
Better overclocked clock speed (Water) 1.7 GHz vs 1.4 GHz More than 20% better overclocked clock speed (Water)
Front view of AMD Sempron 2500+

Reasons to consider the
AMD Sempron 2500+

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Better overclocked clock speed (Air) 2.21 GHz vs 1.71 GHz Around 30% better overclocked clock speed (Air)

Benchmarks Real world tests of Celeron B820 vs Sempron 2500+

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

Celeron B820
84,100 MB/s
Sempron 2500+
38.7 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Celeron B820  vs
Sempron 2500+ 
Clock speed 1.7 GHz 1.75 GHz
Cores Dual core Single core
Socket type
rPGA 988B
754
462

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3

details

Celeron B820  vs
Sempron 2500+ 
Threads 2 1
L2 cache 1 MB 0.25 MB
L2 cache per core 0.5 MB/core 0.25 MB/core
Manufacture process 32 nm 130 nm
Max CPUs 1 1
Operating temperature Unknown - 100°C Unknown - 69°C

overclocking

Overclocked clock speed 1.71 GHz 2.21 GHz
Overclocked clock speed (Water) 1.7 GHz 1.4 GHz
Overclocked clock speed (Air) 1.71 GHz 2.21 GHz

power consumption

TDP 35W 59W
Annual home energy cost 8.43 $/year 14.21 $/year
Annual commercial energy cost 30.66 $/year 51.68 $/year
Performance per watt 2.58 pt/W 0.41 pt/W
Typical power consumption 28.44W 47.94W
Intel Celeron B820
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AMD Sempron 2500+
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