CPUBoss Review Our evaluation of E8400 vs E6600


Benchmark performance using all cores

PassMark, GeekBench (32-bit) and GeekBench (64-bit)

Single-core Performance

Individual core benchmark performance

PassMark (Single Core)


How much speed can you get out of the processor?

overclock popularity


Are you paying a premium for performance?

Performance Per Dollar

CPUBoss Score

Performance, Single-core Performance, Overclocking and Value

Intel Core2 Duo E8400 

CPUBoss recommends the Intel Core2 Duo E8400  based on its performance, single-core performance and value.

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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 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 3 GHz vs 2.4 GHz More than 25% higher clock speed
Much better performance per dollar 26.09 pt/$ vs 10.98 pt/$ Around 2.5x better performance per dollar
More l2 cache 6 MB vs 4 MB 50% more l2 cache; more data can be stored in the l2 cache for quick access later
Much better 3DMark11 physics score 2,310 vs 1,680 Around 40% better 3DMark11 physics score
Much more l2 cache per core 3 MB/core vs 2 MB/core 50% more l2 cache per core
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Much higher Maximum operating temperature 72.4 °C vs 60.1 °C More than 20% higher Maximum operating temperature
Better PassMark (Single core) score 1,257 vs 919 More than 35% better PassMark (Single core) score
Newer Jan, 2008 vs Jul, 2006 Release date over 1 years later
Slightly better performance per watt 5.62 pt/W vs 3.99 pt/W More than 40% better performance per watt
Front view of Intel Core2 Duo E6600

Reasons to consider the
Intel Core2 Duo E6600

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CPUBoss is not aware of any important advantages of the E6600 vs the E8400.

Benchmarks Real world tests of Core2 Duo E8400 vs E6600

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs


3D Mark 11 (Physics)

PassMark Data courtesy PassMark

PassMark (Single Core) Data courtesy PassMark

Reviews Word on the street

Specifications Full list of technical specs


Core2 Duo E8400  vs
Clock speed 3 GHz 2.4 GHz
Cores Dual core Dual core
Socket type
LGA 775


Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
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 5.62 pt/W 3.99 pt/W
Typical power consumption 52.81W 52.81W


Core2 Duo E8400  vs
Architecture x86-64 x86-64
Threads 2 2
L2 cache 6 MB 4 MB
L2 cache per core 3 MB/core 2 MB/core
Manufacture process 45 nm 65 nm
Transistor count 410,000,000 291,000,000
Max CPUs 1 1
Clock multiplier 9 9
Voltage range 0.85 - 1.36V 0.85 - 1.5V
Operating temperature Unknown - 72.4°C Unknown - 60.1°C


Overclock popularity 125 47
Overclock review score 4.5 5

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


Architecture FSB FSB
Number of links 1 1
Clock speed 1,333 MHz 1,066 MHz
Intel Core2 Duo E8400
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Intel Core2 Duo E6600
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