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Differences What are the advantages of each

Front view of Intel Core i7 2655LE

Reasons to consider the
Intel Core i7 2655LE

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Significantly better performance per watt 23.92 pt/W vs 20.44 pt/W More than 15% better performance per watt
Lower typical power consumption 20.31W vs 28.44W Around 30% lower typical power consumption
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Lower annual commercial energy cost 21.9 $/year vs 30.66 $/year Around 30% lower annual commercial energy cost
Lower annual home energy cost 6.02 $/year vs 8.43 $/year Around 30% lower annual home energy cost
Front view of Intel Core i5 2520M

Reasons to consider the
Intel Core i5 2520M

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Much better turbo clock speed 1,300 MHz vs 1,000 MHz 30% better turbo clock speed
Higher clock speed 2.5 GHz vs 2.2 GHz Around 15% higher clock speed
Much better performance per dollar 2.86 pt/$ vs 1.83 pt/$ More than 55% better performance per dollar
Higher turbo clock speed 3.2 GHz vs 2.9 GHz More than 10% higher turbo clock speed
Better geekbench 3 Multi-Core score 4,982 vs 3,649 More than 35% better geekbench 3 Multi-Core score
Significantly better overclocked clock speed (Air) 3.05 GHz vs 2.2 GHz Around 40% better overclocked clock speed (Air)
Slightly better PassMark (Single core) score 1,493 vs 1,350 More than 10% better PassMark (Single core) score
Better overclocked clock speed (Water) 2.5 GHz vs 2.2 GHz Around 15% better overclocked clock speed (Water)

Benchmarks Real world tests of Core i7 2655LE vs i5 2520M

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 2655LE
1,470,000 MB/s
Core i5 2520M
2,080,000 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 2655LE  vs
i5 2520M 
Clock speed 2.2 GHz 2.5 GHz
Turbo clock speed 2.9 GHz 3.2 GHz
Cores Dual core Dual core
Socket type
BGA 1023
rPGA 988B
Is unlocked No No

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
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 25W 35W
Annual home energy cost 6.02 $/year 8.43 $/year
Annual commercial energy cost 21.9 $/year 30.66 $/year
Performance per watt 23.92 pt/W 20.44 pt/W
Typical power consumption 20.31W 28.44W

bus

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

details

Core i7 2655LE  vs
i5 2520M 
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 32 nm
Max CPUs 1 1
Clock multiplier 22 25
Operating temperature Unknown - 100°C Unknown - 100°C

overclocking

Overclocked clock speed 2.2 GHz 3.05 GHz
Overclocked clock speed (Water) 2.2 GHz 2.5 GHz
Overclocked clock speed (Air) 2.2 GHz 3.05 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 3000 HD Graphics 3000
Number of displays supported 2 2
GPU clock speed 650 MHz 650 MHz
Turbo clock speed 1,000 MHz 1,300 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Supports ECC Yes No
Maximum bandwidth 21,333.32 MB/s 21,333.32 MB/s
Maximum memory size 16,998.4 MB 16,384 MB
Intel Core i7 2655LE
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Intel Core i5 2520M
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