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Differences What are the advantages of each

Front view of Intel Core i7 940XM

Reasons to consider the
Intel Core i7 940XM

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Front view of Intel Core i7 640M

Reasons to consider the
Intel Core i7 640M

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required

Benchmarks Real world tests of Core i7 940XM vs 640M

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 940XM
139,300 MB/s
Core i7 640M
1,570,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

3D Mark 06 (CPU)

Specifications Full list of technical specs

summary

Core i7 940XM  vs
640M 
Clock speed 2.13 GHz 2.8 GHz
Turbo clock speed 3.33 GHz 3.46 GHz
Cores Quad core Dual core
Socket type
rPGA 988A
BGA 1288
Is unlocked Yes No

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 55W 35W
Annual home energy cost 13.25 $/year 8.43 $/year
Performance per watt 3.39 pt/W 18.3 pt/W
Typical power consumption 44.69W 28.44W

bus

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

details

Core i7 940XM  vs
640M 
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 8 MB 4 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 32 nm
Transistor count 774,000,000 382,000,000
Max CPUs 1 1
Clock multiplier 16 21

overclocking

Overclocked clock speed 3.54 GHz 3.37 GHz
Overclocked clock speed (Water) 2.13 GHz 2.8 GHz
Overclocked clock speed (Air) 3.54 GHz 3.37 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics
Number of displays supported N/A 2
GPU clock speed N/A 500 MHz
Turbo clock speed N/A 766 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 21,333.32 MB/s 17,066.66 MB/s
Maximum memory size 8,192 MB 8,192 MB
Intel Core i7 940XM
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Intel Core i7 640M
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