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Differences What are the advantages of each

Front view of AMD Phenom II X2 550

Reasons to consider the
AMD Phenom II X2 550

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Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3.1 GHz vs 2.3 GHz Around 35% higher clock speed
Much better PassMark score 2,028 vs 1,145 More than 75% better PassMark score
Much better PassMark (Single core) score 1,067 vs 691 Around 55% better PassMark (Single core) score
Much better geekbench 2 (32-bit) score 2,839 vs 1,629 Around 75% better geekbench 2 (32-bit) score
Much better overclocked clock speed (Air) 3.81 GHz vs 2.75 GHz Around 40% 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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Much lower typical power consumption 52.81W vs 124.5W 2.4x lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 46.25 $/year 3x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 120.89 $/year 2.1x lower annual commercial energy cost

Benchmarks Real world tests of Phenom II X2 550 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

Phenom II X2 550
125,000 MB/s
Athlon 64 X2 4400+
85.5 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X2 550  vs
Athlon 64 X2 4400+ 
Clock speed 3.1 GHz 2.3 GHz
Cores Dual core Dual core
Socket type
AM3
AM2
939

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!
Supports dynamic frequency scaling Yes Yes

details

Phenom II X2 550  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 45 nm 90 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.81 GHz 2.75 GHz
Overclocked clock speed (Water) 3.12 GHz 3.13 GHz
PassMark (Overclocked) 1,881.5 1,605.4
Overclocked clock speed (Air) 3.81 GHz 2.75 GHz

power consumption

TDP 80W 65W
Annual home energy cost 46.25 $/year 15.66 $/year
Annual commercial energy cost 120.89 $/year 56.94 $/year
Performance per watt 0.89 pt/W 0.89 pt/W
Typical power consumption 124.5W 52.81W
AMD Phenom II X2 550
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AMD Athlon 64 X2 4400+
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