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Differences What are the advantages of each

Front view of Intel Core2 Duo E6420

Reasons to consider the
Intel Core2 Duo E6420

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Much better overclocked clock speed (Water) 4 GHz vs 3.33 GHz More than 20% better overclocked clock speed (Water)
Newer Apr, 2007 vs Jul, 2006 Release date 9 months later
Front view of Intel Core2 Duo E6400

Reasons to consider the
Intel Core2 Duo E6400

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Higher Maximum operating temperature 61.4 °C vs 60.1 °C Almost the same

Benchmarks Real world tests of Core2 Duo E6420 vs E6400

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 E6420
91,000 MB/s
Core2 Duo E6400
91,000 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 E6420  vs
E6400 
Clock speed 2.13 GHz 2.13 GHz
Cores Dual core Dual core
Socket type
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
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 1.37 pt/W 1.35 pt/W
Typical power consumption 52.81W 52.81W

bus

Architecture FSB FSB
Number of links 1 1
Clock speed 1,066 MHz 1,066 MHz

details

Core2 Duo E6420  vs
E6400 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 4 MB 2 MB
L2 cache per core 2 MB/core 1 MB/core
Manufacture process 65 nm 65 nm
Transistor count 291,000,000 167,000,000
Max CPUs 1 1
Clock multiplier 8 8
Voltage range 0.85 - 1.5V 0.85 - 1.5V
Operating temperature Unknown - 60.1°C Unknown - 61.4°C

overclocking

Overclocked clock speed 3.37 GHz 3.33 GHz
Overclocked clock speed (Water) 4 GHz 3.33 GHz
Overclocked clock speed (Air) 3.37 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 E6420
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Intel Core2 Duo E6400
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