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Differences What are the advantages of each

Front view of Intel Core2 Duo E4400

Reasons to consider the
Intel Core2 Duo E4400

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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 better performance per watt 1.25 pt/W vs 0.73 pt/W More than 70% 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) 3.16 GHz vs 2.77 GHz Around 15% better overclocked clock speed (Air)
Much higher Maximum operating temperature 61.4 °C vs 55 °C More than 10% higher Maximum operating temperature
Better overclocked clock speed (Water) 3.53 GHz vs 3.24 GHz Around 10% better overclocked clock speed (Water)
Newer Apr, 2007 vs May, 2006 Release date 11 months later
Front view of AMD Athlon X2 4000+

Reasons to consider the
AMD Athlon X2 4000+

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Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Higher clock speed 2.1 GHz vs 2 GHz More than 5% higher clock speed

Benchmarks Real world tests of Core2 Duo E4400 vs Athlon X2 4000+

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 E4400
85,000 MB/s
Athlon X2 4000+
62.3 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 E4400  vs
Athlon X2 4000+ 
Clock speed 2 GHz 2.1 GHz
Cores Dual core Dual core
Socket type
LGA 775
AM2

features

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

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 1.25 pt/W 0.73 pt/W
Typical power consumption 52.81W 52.81W

details

Core2 Duo E4400  vs
Athlon X2 4000+ 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 2 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 65 nm 65 nm
Max CPUs 1 1
Operating temperature Unknown - 61.4°C Unknown - 55°C

overclocking

Overclocked clock speed 3.16 GHz 2.77 GHz
Overclocked clock speed (Water) 3.53 GHz 3.24 GHz
Overclocked clock speed (Air) 3.16 GHz 2.77 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
Intel Core2 Duo E4400
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AMD Athlon X2 4000+
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