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Differences What are the advantages of each

Front view of AMD Phenom II X4 965

Reasons to consider the
AMD Phenom II X4 965

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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 higher clock speed 3.4 GHz vs 2.3 GHz Around 50% higher clock speed
Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better PassMark score 5,916 vs 1,145 Around 5.2x better PassMark score
Much better PassMark (Single core) score 1,361 vs 691 More than 95% better PassMark (Single core) score
Much better geekbench 2 (32-bit) score 5,974 vs 1,629 Around 3.8x 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 overclocked clock speed (Air) 4.05 GHz vs 2.75 GHz More than 45% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.22 GHz vs 3.13 GHz Around 35% 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 152.93W 2.9x lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 54.06 $/year 3.5x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 152.42 $/year 2.7x lower annual commercial energy cost

Benchmarks Real world tests of Phenom II X4 965 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 965
137,800 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 X4 965  vs
Athlon 64 X2 4400+ 
Clock speed 3.4 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 965  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 4.05 GHz 2.75 GHz
Overclocked clock speed (Water) 4.22 GHz 3.13 GHz
PassMark (Overclocked) 3,136.7 1,605.4
Overclocked clock speed (Air) 4.05 GHz 2.75 GHz

power consumption

TDP 140W 65W
Annual home energy cost 54.06 $/year 15.66 $/year
Annual commercial energy cost 152.42 $/year 56.94 $/year
Performance per watt 1.08 pt/W 0.89 pt/W
Typical power consumption 152.93W 52.81W
AMD Phenom II X4 965
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AMD Athlon 64 X2 4400+
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