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Differences What are the advantages of each

Front view of Intel Core i7 3687U

Reasons to consider the
Intel Core i7 3687U

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Much better performance per watt 45.76 pt/W vs 2.79 pt/W Around 16.5x better performance per watt
More l2 cache 1 MB vs 0.5 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Significantly newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 13.81W vs 52.81W 3.8x lower typical power consumption
Much better performance per dollar 2.25 pt/$ vs 1.34 pt/$ Around 70% better performance per dollar
Much higher Maximum operating temperature 105 °C vs 69.1 °C More than 50% higher Maximum operating temperature
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
More number of displays supported 3 vs 2 1 more number of displays supported
Better turbo clock speed 1,200 MHz vs 1,100 MHz Around 10% better turbo clock speed
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Better geekbench 3 single core score 2,660 vs 2,371 More than 10% better geekbench 3 single core score
Newer Jan, 2013 vs Jan, 2011 Release date over 2 years later
Much lower annual home energy cost 4.1 $/year vs 15.66 $/year 3.8x lower annual home energy cost
Much lower annual commercial energy cost 14.89 $/year vs 56.94 $/year 3.8x lower annual commercial energy cost
Slightly better geekbench 3 Multi-Core score 5,539 vs 5,074 Around 10% better geekbench 3 Multi-Core score
Front view of Intel Core i3 2120

Reasons to consider the
Intel Core i3 2120

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Significantly higher clock speed 3.3 GHz vs 2.1 GHz More than 55% higher clock speed
Much higher GPU clock speed 850 MHz vs 350 MHz Around 2.5x higher GPU clock speed
Significantly better overclocked clock speed (Water) 3.37 GHz vs 2.1 GHz More than 60% better overclocked clock speed (Water)
Better overclocked clock speed (Air) 3.42 GHz vs 3.17 GHz Around 10% better overclocked clock speed (Air)

Benchmarks Real world tests of Core i7 3687U vs i3 2120

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 3687U
2,155,000 MB/s
Core i3 2120
162,800 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 3687U  vs
i3 2120 
Clock speed 2.1 GHz 3.3 GHz
Cores Dual core Dual core
Socket type
BGA 1023
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 17W 65W
Annual home energy cost 4.1 $/year 15.66 $/year
Annual commercial energy cost 14.89 $/year 56.94 $/year
Performance per watt 45.76 pt/W 2.79 pt/W
Typical power consumption 13.81W 52.81W

bus

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

details

Core i7 3687U  vs
i3 2120 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 1 MB 0.5 MB
L2 cache per core 0.5 MB/core 0.25 MB/core
L3 cache 4 MB 3 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 22 nm 32 nm
Max CPUs 1 1
Clock multiplier 21 33
Operating temperature Unknown - 105°C Unknown - 69.1°C

overclocking

Overclocked clock speed 3.17 GHz 3.42 GHz
Overclocked clock speed (Water) 2.1 GHz 3.37 GHz
Overclocked clock speed (Air) 3.17 GHz 3.42 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 4000 Intel® HD Graphics 2000
Number of displays supported 3 2
GPU clock speed 350 MHz 850 MHz
Turbo clock speed 1,200 MHz 1,100 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Maximum bandwidth 12,800 MB/s 21,333.32 MB/s
Maximum memory size 32,768 MB 32,768 MB
Intel Core i7 3687U
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Intel Core i3 2120
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