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Differences What are the advantages of each

Front view of Intel Core i7 2715QE

Reasons to consider the
Intel Core i7 2715QE

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Slightly more l3 cache 6 MB vs 4 MB 50% more l3 cache; more data can be stored in the l3 cache for quick access later
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 8 vs 4 Twice as many threads
Better PassMark score 5,365 vs 3,929 More than 35% better PassMark score
Better performance per dollar 2.17 pt/$ vs 2.08 pt/$ Around 5% better performance per dollar
Front view of Intel Core i7 2640M

Reasons to consider the
Intel Core i7 2640M

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Higher clock speed 2.8 GHz vs 2.1 GHz Around 35% higher clock speed
Higher turbo clock speed 3.5 GHz vs 3 GHz More than 15% higher turbo clock speed
Significantly better performance per watt 20.53 pt/W vs 16.09 pt/W Around 30% better performance per watt
Significantly better overclocked clock speed (Air) 3.33 GHz vs 2.1 GHz Around 60% better overclocked clock speed (Air)
Better turbo clock speed 1,300 MHz vs 1,200 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
Lower typical power consumption 28.44W vs 36.56W More than 20% lower typical power consumption
Better PassMark (Single core) score 1,597 vs 1,272 More than 25% better PassMark (Single core) score
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Better overclocked clock speed (Water) 2.8 GHz vs 2.1 GHz Around 35% better overclocked clock speed (Water)
Newer Sep, 2011 vs Jan, 2011 Release date 7 months later
Lower annual home energy cost 8.43 $/year vs 10.84 $/year More than 20% lower annual home energy cost
Lower annual commercial energy cost 30.66 $/year vs 39.42 $/year More than 20% lower annual commercial energy cost

Benchmarks Real world tests of Core i7 2715QE vs 2640M

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 2715QE
1,690,000 MB/s
Core i7 2640M
2,290,000 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 2715QE  vs
2640M 
Clock speed 2.1 GHz 2.8 GHz
Turbo clock speed 3 GHz 3.5 GHz
Cores Quad 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
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 45W 35W
Annual home energy cost 10.84 $/year 8.43 $/year
Annual commercial energy cost 39.42 $/year 30.66 $/year
Performance per watt 16.09 pt/W 20.53 pt/W
Typical power consumption 36.56W 28.44W

bus

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

details

Core i7 2715QE  vs
2640M 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 6 MB 4 MB
L3 cache per core 1.5 MB/core 2 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 1 1
Clock multiplier 21 28
Operating temperature Unknown - 100°C Unknown - 100°C

overclocking

Overclocked clock speed 2.1 GHz 3.33 GHz
Overclocked clock speed (Water) 2.1 GHz 2.8 GHz
Overclocked clock speed (Air) 2.1 GHz 3.33 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 3000 Intel® HD Graphics 3000
Number of displays supported 2 2
GPU clock speed 650 MHz 650 MHz
Turbo clock speed 1,200 MHz 1,300 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Supports ECC Yes No
Maximum bandwidth 25,600 MB/s 21,333.32 MB/s
Maximum memory size 16,998.4 MB 16,384 MB
Intel Core i7 2715QE
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Intel Core i7 2640M
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