CPUBoss Review Our evaluation of E8400 vs 6400+ among desktop CPUs

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

3.8

CPUBoss Score

Combination of all six facets

Winner
Intel Core2 Duo E8400 

CPUBoss recommends the Intel Core2 Duo E8400  based on its .

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Differences What are the advantages of each

Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 1.83 pt/W vs 0.56 pt/W More than 3.2x better performance per watt
Much lower typical power consumption 52.81W vs 101.56W Around 50% lower typical power consumption
Much higher Maximum operating temperature 72.4 °C vs 55 °C More than 30% higher Maximum operating temperature
Much better overclocked clock speed (Air) 4.22 GHz vs 3.42 GHz Around 25% better overclocked clock speed (Air)
Much lower annual home energy cost 15.66 $/year vs 30.11 $/year Around 50% lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 109.5 $/year Around 50% lower annual commercial energy cost
Much better overclocked clock speed (Water) 4.23 GHz vs 3.53 GHz Around 20% better overclocked clock speed (Water)
Front view of AMD Athlon X2 6400+

Reasons to consider the
AMD Athlon X2 6400+

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Higher clock speed 3.2 GHz vs 3 GHz More than 5% higher clock speed

Benchmarks Real world tests of Core2 Duo E8400 vs Athlon X2 6400+

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 E8400
128,000 MB/s
Athlon X2 6400+
87.5 MB/s

3D Mark 11 (Physics)

Cinebench R10 32-Bit

sysmark 2007 (overall)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core2 Duo E8400  vs
Athlon X2 6400+ 
Clock speed 3 GHz 3.2 GHz
Cores Dual core Dual core
Socket type
LGA 775
AM2

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 125W
Annual home energy cost 15.66 $/year 30.11 $/year
Annual commercial energy cost 56.94 $/year 109.5 $/year
Performance per watt 1.83 pt/W 0.56 pt/W
Typical power consumption 52.81W 101.56W

details

Core2 Duo E8400  vs
Athlon X2 6400+ 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 6 MB 2 MB
L2 cache per core 3 MB/core 1 MB/core
Manufacture process 45 nm 90 nm
Max CPUs 1 1
Voltage range 0.85 - 1.36V 1.35 - 1.4V
Operating temperature Unknown - 72.4°C Unknown - 55°C

overclocking

Overclocked clock speed 4.22 GHz 3.42 GHz
Overclocked clock speed (Water) 4.23 GHz 3.53 GHz
Overclocked clock speed (Air) 4.22 GHz 3.42 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 E8400
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AMD Athlon X2 6400+
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