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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 more l2 cache 6 MB vs 0.5 MB 12x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly higher clock speed 3 GHz vs 2.13 GHz More than 40% higher clock speed
Much more l2 cache per core 3 MB/core vs 0.25 MB/core 12x more l2 cache per core
Much better overclocked clock speed (Air) 4.22 GHz vs 2.8 GHz More than 50% better overclocked clock speed (Air)
Better PassMark (Single core) score 1,251 vs 1,048 Around 20% better PassMark (Single core) score
Much better overclocked clock speed (Water) 4.23 GHz vs 2.13 GHz Around 2x better overclocked clock speed (Water)
Front view of Intel Core i7 640LM

Reasons to consider the
Intel Core i7 640LM

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much better performance per watt 21.08 pt/W vs 1.83 pt/W More than 11.5x better performance per watt
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 20.31W vs 52.81W 2.6x lower typical power consumption
Newer Jan, 2010 vs Jan, 2008 Release date over 2 years later
More threads 4 vs 2 Twice as many threads
Much lower annual home energy cost 6.02 $/year vs 15.66 $/year 2.6x lower annual home energy cost
Much lower annual commercial energy cost 21.9 $/year vs 56.94 $/year 2.6x lower annual commercial energy cost

Benchmarks Real world tests of Core2 Duo E8400 vs Core i7 640LM

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
Core i7 640LM
1,300,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core2 Duo E8400  vs
Core i7 640LM 
Clock speed 3 GHz 2.13 GHz
Cores Dual core Dual core
Socket type
LGA 775
BGA 1288

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 25W
Annual home energy cost 15.66 $/year 6.02 $/year
Annual commercial energy cost 56.94 $/year 21.9 $/year
Performance per watt 1.83 pt/W 21.08 pt/W
Typical power consumption 52.81W 20.31W

details

Core2 Duo E8400  vs
Core i7 640LM 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 6 MB 0.5 MB
L2 cache per core 3 MB/core 0.25 MB/core
Manufacture process 45 nm 32 nm
Transistor count 410,000,000 382,000,000
Max CPUs 1 1
Clock multiplier 9 16

overclocking

Overclocked clock speed 4.22 GHz 2.8 GHz
Overclocked clock speed (Water) 4.23 GHz 2.13 GHz
Overclocked clock speed (Air) 4.22 GHz 2.8 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics
Number of displays supported N/A 2
GPU clock speed N/A 266 MHz
Turbo clock speed N/A 566 MHz

bus

Architecture FSB DMI
Number of links 1 1
Intel Core2 Duo E8400
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Intel Core i7 640LM
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