Intel Core2 Duo E8400 vs E6400

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Intel Core2 Duo E8400

Intel Core2 Duo E6400

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Reasons to consider the
Intel Core2 Duo E8400

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Much higher clock speed

3 GHz

2.13 GHz

More than 40% higher clock speed

Much better PassMark score

2,160

1,295

More than 65% better PassMark score

Much better geekbench 2 (32-bit) score

2,826

1,961

Around 45% better geekbench 2 (32-bit) score

Much newer manufacturing process

45 nm

65 nm

A newer manufacturing process allows for a more powerful, yet cooler running processor

Much better overclocked clock speed (Air)

4.22 GHz

3.33 GHz

More than 25% better overclocked clock speed (Air)

Supports trusted computing

Yes

Somewhat common; Allows for safer, more reliable computing

Much higher Maximum operating temperature

72.4 °C

61.4 °C

Around 20% higher Maximum operating temperature

Much better overclocked clock speed (Water)

4.23 GHz

3.33 GHz

More than 25% better overclocked clock speed (Water)

Newer

Jan, 2008

Jul, 2006

Release date over 1 years later

1,251

Core2 Duo E6400

801

summary	Core2 Duo E8400	E6400
Clock speed	3 GHz	2.13 GHz
Cores	Dual core	Dual core
Socket type
LGA 775
features
Has a NX bit	Yes	Yes
Supports trusted computing	Yes	No
Has virtualization support	Yes	Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
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	1.83 pt/W	1.35 pt/W
Typical power consumption	52.81W	52.81W
bus
Architecture	FSB	FSB
Number of links	1	1
Clock speed	1,333 MHz	1,066 MHz

details	Core2 Duo E8400	E6400
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	65 nm
Transistor count	410,000,000	167,000,000
Max CPUs	1	1
Clock multiplier	9	8
Voltage range	0.85 - 1.36V	0.85 - 1.5V
Operating temperature	Unknown - 72.4°C	Unknown - 61.4°C
overclocking
Overclock popularity	125	15
Overclocked clock speed	4.22 GHz	3.33 GHz
Overclocked clock speed (Water)	4.23 GHz	3.33 GHz
Overclocked clock speed (Air)	4.22 GHz	3.33 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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Intel Core2 Duo E6400

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	Much higher clock speed 3 GHz		Much better PassMark score 2,160
	Much better geekbench 2 (32-bit) score 2,826		Much newer manufacturing process 45 nm

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Intel Core2 Duo E8400 vs E6400