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Differences What are the advantages of each

Front view of AMD Phenom II X4 945 95W

Reasons to consider the
AMD Phenom II X4 945 95W

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Much more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
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 GHz vs 2.3 GHz More than 30% higher clock speed
Much better PassMark score 3,690 vs 1,145 Around 3.2x better PassMark score
Much better PassMark (Single core) score 1,039 vs 691 More than 50% better PassMark (Single core) score
Much better geekbench 2 (32-bit) score 5,183 vs 1,629 Around 3.2x better geekbench 2 (32-bit) score
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much better performance per watt 1.57 pt/W vs 0.89 pt/W More than 75% better performance per watt
Much better overclocked clock speed (Air) 3.68 GHz vs 2.75 GHz Around 35% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3.81 GHz vs 3.13 GHz More than 20% better overclocked clock speed (Water)
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 77.19W More than 30% lower typical power consumption
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost

Benchmarks Real world tests of Phenom II X4 945 95W 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 X4 945 95W
120,900 MB/s
Athlon 64 X2 4400+
85.5 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X4 945 95W  vs
Athlon 64 X2 4400+ 
Clock speed 3 GHz 2.3 GHz
Cores Quad 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 X4 945 95W  vs
Athlon 64 X2 4400+ 
Threads 4 2
L2 cache 2 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 3.68 GHz 2.75 GHz
Overclocked clock speed (Water) 3.81 GHz 3.13 GHz
Overclocked clock speed (Air) 3.68 GHz 2.75 GHz

power consumption

TDP 95W 65W
Annual home energy cost 22.89 $/year 15.66 $/year
Annual commercial energy cost 83.22 $/year 56.94 $/year
Performance per watt 1.57 pt/W 0.89 pt/W
Typical power consumption 77.19W 52.81W
AMD Phenom II X4 945 95W
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AMD Athlon 64 X2 4400+
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