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Differences What are the advantages of each

Front view of Intel Core2 Duo E6300

Reasons to consider the
Intel Core2 Duo E6300

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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 65 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 1.18 pt/W vs 0.89 pt/W More than 30% better performance per watt
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much better overclocked clock speed (Air) 3.19 GHz vs 2.75 GHz More than 15% better overclocked clock speed (Air)
Better overclocked clock speed (Water) 3.45 GHz vs 3.13 GHz More than 10% 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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Significantly higher clock speed 2.3 GHz vs 1.86 GHz Around 25% higher clock speed

Benchmarks Real world tests of Core2 Duo E6300 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

Core2 Duo E6300
79,500 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

Core2 Duo E6300  vs
Athlon 64 X2 4400+ 
Clock speed 1.86 GHz 2.3 GHz
Cores Dual core Dual core
Socket type
LGA 775
AM2
939

features

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

details

Core2 Duo E6300  vs
Athlon 64 X2 4400+ 
Threads 2 2
L2 cache 2 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 65 nm 90 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.19 GHz 2.75 GHz
Overclocked clock speed (Water) 3.45 GHz 3.13 GHz
Overclocked clock speed (Air) 3.19 GHz 2.75 GHz

power consumption

TDP 65W 65W
Annual home energy cost 15.66 $/year 15.66 $/year
Annual commercial energy cost 56.94 $/year 56.94 $/year
Performance per watt 1.18 pt/W 0.89 pt/W
Typical power consumption 52.81W 52.81W
Intel Core2 Duo E6300
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AMD Athlon 64 X2 4400+
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