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Differences What are the advantages of each

Front view of AMD Sempron 3800+

Reasons to consider the
AMD Sempron 3800+

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Slightly lower typical power consumption 50.38W vs 52.81W Around 5% lower typical power consumption
Slightly lower annual commercial energy cost 54.31 $/year vs 56.94 $/year Around 5% lower annual commercial energy cost
Slightly lower annual home energy cost 14.94 $/year vs 15.66 $/year Around 5% lower annual home energy cost
Front view of AMD Athlon 64 X2 4400+

Reasons to consider the
AMD Athlon 64 X2 4400+

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Significantly more l2 cache 1 MB vs 0 MB Compared to all cpus, 1 MB l2 cache is just OK
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much more l2 cache per core 0.5 MB/core vs 0 MB/core Compared to all cpus, 0.5 MB/core l2 cache per core is just OK
Better geekbench 3 single core score 1,282 vs 859 Around 50% better geekbench 3 single core score
Better overclocked clock speed (Air) 2.75 GHz vs 2.2 GHz Around 25% better overclocked clock speed (Air)
More cores 2 vs 1 Twice as many cores; run more applications at once
Significantly better overclocked clock speed (Water) 3.13 GHz vs 2.2 GHz More than 40% better overclocked clock speed (Water)

Benchmarks Real world tests of Sempron 3800+ 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 3800+
59.1 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 3800+  vs
Athlon 64 X2 4400+ 
Clock speed 2.2 GHz 2.3 GHz
Cores Single core Dual core
Socket type
S1
AM2
939

features

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

details

Sempron 3800+  vs
Athlon 64 X2 4400+ 
Threads 1 2
L2 cache 0 MB 1 MB
L2 cache per core 0 MB/core 0.5 MB/core
Manufacture process 90 nm 90 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.2 GHz 2.75 GHz
Overclocked clock speed (Water) 2.2 GHz 3.13 GHz
PassMark (Overclocked) 912.1 1,605.4
Overclocked clock speed (Air) 2.2 GHz 2.75 GHz

power consumption

TDP 62W 65W
Annual home energy cost 14.94 $/year 15.66 $/year
Annual commercial energy cost 54.31 $/year 56.94 $/year
Performance per watt 0.59 pt/W 0.89 pt/W
Typical power consumption 50.38W 52.81W
AMD Sempron 3800+
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AMD Athlon 64 X2 4400+
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