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Differences What are the advantages of each

Front view of Intel Core i7 3940XM

Reasons to consider the
Intel Core i7 3940XM

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Newer Sep, 2012 vs Apr, 2012 Release date 5 months later
Higher turbo clock speed 3.9 GHz vs 3.8 GHz Around 5% higher turbo clock speed
Slightly higher clock speed 3 GHz vs 2.9 GHz Around 5% higher clock speed
Better PassMark score 9,820 vs 9,168 More than 5% better PassMark score
Better turbo clock speed 1,350 MHz vs 1,300 MHz Around 5% better turbo clock speed
Slightly better overclocked clock speed (Water) 3 GHz vs 2.9 GHz Around 5% better overclocked clock speed (Water)
Front view of Intel Core i7 3920XM

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Intel Core i7 3920XM

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Better performance per dollar 0.92 pt/$ vs 0.38 pt/$ Around 2.5x better performance per dollar

Benchmarks Real world tests of Core i7 3940XM vs 3920XM

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 3940XM
2,680,000 MB/s
Core i7 3920XM
2,620,000 MB/s

3D Mark 11 (Physics)

3D Mark 06 (CPU)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 3940XM  vs
3920XM 
Clock speed 3 GHz 2.9 GHz
Turbo clock speed 3.9 GHz 3.8 GHz
Cores Quad core Quad core
Socket type
rPGA 988B
Is unlocked Yes Yes

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 55W 55W
Annual home energy cost 13.25 $/year 13.25 $/year
Performance per watt 15.11 pt/W 18.41 pt/W
Typical power consumption 44.69W 44.69W

bus

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

details

Core i7 3940XM  vs
3920XM 
Architecture x86-64 x86-64
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 22 nm 22 nm
Max CPUs 1 1
Clock multiplier 30 29
Operating temperature Unknown - 105°C Unknown - 105°C

overclocking

Overclocked clock speed 4.47 GHz 4.48 GHz
Overclocked clock speed (Water) 3 GHz 2.9 GHz
PassMark (Overclocked) 6,125.4 6,883.3
Overclocked clock speed (Air) 4.47 GHz 4.48 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics 4000 Intel® HD Graphics 4000
Number of displays supported 3 3
GPU clock speed 650 MHz 650 MHz
Turbo clock speed 1,350 MHz 1,300 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3L-1600
DDR3L-1333
DDR3RS-1600
DDR3RS-1333
DDR3
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 12,800 MB/s 25,600 MB/s
Maximum memory size 32,768 MB 32,768 MB
Intel Core i7 3940XM
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Intel Core i7 3920XM
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