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Differences What are the advantages of each

Front view of Intel Core i7 640M

Reasons to consider the
Intel Core i7 640M

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Much better performance per watt 18.3 pt/W vs 2.97 pt/W Around 6.2x better performance per watt
Lower typical power consumption 28.44W vs 44.69W More than 35% lower typical power consumption
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Significantly better performance per dollar 1.85 pt/$ vs 1.46 pt/$ More than 25% better performance per dollar
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Lower annual home energy cost 8.43 $/year vs 13.25 $/year More than 35% lower annual home energy cost
Lower annual commercial energy cost 30.66 $/year vs 48.18 $/year More than 35% lower annual commercial energy cost
Front view of Intel Core i3 3225

Reasons to consider the
Intel Core i3 3225

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Higher clock speed 3.3 GHz vs 2.8 GHz Around 20% higher clock speed
Significantly newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better turbo clock speed 1,050 MHz vs 766 MHz More than 35% better turbo clock speed
Higher GPU clock speed 650 MHz vs 500 MHz 30% higher GPU clock speed
More number of displays supported 3 vs 2 1 more number of displays supported
Better PassMark (Single core) score 1,773 vs 1,307 More than 35% better PassMark (Single core) score
Better geekbench 3 Multi-Core score 5,412 vs 4,385 Around 25% better geekbench 3 Multi-Core score
Newer Sep, 2012 vs Sep, 2010 Release date over 1 years later
Better overclocked clock speed (Water) 3.3 GHz vs 2.8 GHz Around 20% better overclocked clock speed (Water)

Benchmarks Real world tests of Core i7 640M vs i3 3225

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

Core i7 640M
1,570,000 MB/s
Core i3 3225
169,900 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

Core i7 640M  vs
i3 3225 
Clock speed 2.8 GHz 3.3 GHz
Cores Dual core Dual core
Socket type
BGA 1288
rPGA 988A
LGA 1155
Is unlocked No No

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 35W 55W
Annual home energy cost 8.43 $/year 13.25 $/year
Annual commercial energy cost 30.66 $/year 48.18 $/year
Performance per watt 18.3 pt/W 2.97 pt/W
Typical power consumption 28.44W 44.69W

bus

Architecture DMI DMI
Number of links 1 1
Transfer rate 2,500 MT/s 5,000 MT/s

details

Core i7 640M  vs
i3 3225 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 1 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache 4 MB 3 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 32 nm 22 nm
Max CPUs 1 1
Clock multiplier 21 33

overclocking

Overclocked clock speed 3.37 GHz 3.49 GHz
Overclocked clock speed (Water) 2.8 GHz 3.3 GHz
Overclocked clock speed (Air) 3.37 GHz 3.49 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics Intel® HD Graphics 4000
Number of displays supported 2 3
GPU clock speed 500 MHz 650 MHz
Turbo clock speed 766 MHz 1,050 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 17,066.66 MB/s 25,600 MB/s
Maximum memory size 8,192 MB 32,768 MB
Intel Core i7 640M
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Intel Core i3 3225
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