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Differences What are the advantages of each

Front view of Intel Core2 Duo E6400

Reasons to consider the
Intel Core2 Duo E6400

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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 1.35 pt/W vs 0.78 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
Front view of AMD Athlon X2 5200+

Reasons to consider the
AMD Athlon X2 5200+

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Significantly higher clock speed 2.7 GHz vs 2.13 GHz More than 25% higher clock speed
Much higher Maximum operating temperature 68 °C vs 61.4 °C More than 10% higher Maximum operating temperature
Significantly better overclocked clock speed (Air) 3.61 GHz vs 3.33 GHz Around 10% better overclocked clock speed (Air)
Newer Aug, 2010 vs Jul, 2006 Release date over 4 years later

Benchmarks Real world tests of Core2 Duo E6400 vs Athlon X2 5200+

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 E6400
91,000 MB/s
Athlon X2 5200+
54.2 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Reviews Word on the street

Specifications Full list of technical specs

summary

Core2 Duo E6400  vs
Athlon X2 5200+ 
Clock speed 2.13 GHz 2.7 GHz
Cores Dual core Dual core
Socket type
LGA 775
AM3
AM2

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
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 1.35 pt/W 0.78 pt/W
Typical power consumption 52.81W 52.81W

details

Core2 Duo E6400  vs
Athlon X2 5200+ 
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
Voltage range 0.85 - 1.5V 0.95 - 1.4V
Operating temperature Unknown - 61.4°C 55 - 68°C

overclocking

Overclocked clock speed 3.33 GHz 3.61 GHz
Overclocked clock speed (Water) 3.33 GHz 3.38 GHz
Overclocked clock speed (Air) 3.33 GHz 3.61 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

bus

Clock speed 1,066 MHz 2,000 MHz
Intel Core2 Duo E6400
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AMD Athlon X2 5200+
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