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Intel Core2 Duo E8400

Front view of Intel Core2 Duo E8400
Front view of Intel Core2 Duo E7400

Intel Core2 Duo E7400

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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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Higher clock speed 3 GHz vs 2.8 GHz More than 5% higher clock speed
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Much better overclocked clock speed (Air) 4.22 GHz vs 3.91 GHz Around 10% better overclocked clock speed (Air)
Front view of Intel Core2 Duo E7400

Reasons to consider the
Intel Core2 Duo E7400

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Higher Maximum operating temperature 74.1 °C vs 72.4 °C Almost the same
Better overclocked clock speed (Water) 4.58 GHz vs 4.23 GHz Around 10% better overclocked clock speed (Water)

Benchmarks Real world tests of Core2 Duo E8400 vs E7400

CompuBench 1.5 (Bitcoin mining) Data courtesy CompuBench

Core2 Duo E8400
2.41 mHash/s
Core2 Duo E7400
2.26 mHash/s

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core2 Duo E8400
2,982
Core2 Duo E7400
2,714

GeekBench 3 (Single core) Data courtesy Primate Labs

Core2 Duo E8400
1,625
Core2 Duo E7400
1,481

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core2 Duo E8400
128,000 MB/s
Core2 Duo E7400
119,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core2 Duo E8400
2,826
Core2 Duo E7400
2,543

GeekBench (64-bit) Data courtesy Primate Labs

Core2 Duo E8400
3,092
Core2 Duo E7400
2,834

PassMark Data courtesy Passmark

Core2 Duo E8400
2,160
Core2 Duo E7400
1,779

PassMark (Single Core)

Core2 Duo E8400
1,251
Core2 Duo E7400
1,147

Specifications Full list of technical specs

summary

 Core2 Duo E8400  vs
E7400 
Clock speed 3 GHz 2.8 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 1.52 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  vs
E7400 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 6 MB 3 MB
L2 cache per core 3 MB/core 1.5 MB/core
Manufacture process 45 nm 45 nm
Transistor count 410,000,000 228,000,000
Max CPUs 1 1
Clock multiplier 9 10
Voltage range 0.85 - 1.36V 0.85 - 1.36V
Operating temperature Unknown - 72.4°C Unknown - 74.1°C

overclocking
Overclocked clock speed 4.22 GHz 3.91 GHz
Overclocked clock speed (Water) 4.23 GHz 4.58 GHz
Overclocked clock speed (Air) 4.22 GHz 3.91 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 E7400
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