CPUBoss Review Our evaluation of 3940XM vs 3740QM among laptop CPUs (over 15W)

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Sky Diver and Cloud Gate

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more

7.6

CPUBoss Score

Combination of all six facets

Winner
Intel Core i7 3940XM 

CPUBoss recommends the Intel Core i7 3940XM  based on its .

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VS

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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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Front view of Intel Core i7 3740QM

Reasons to consider the
Intel Core i7 3740QM

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CPUBoss is not aware of any important advantages of the 3740QM vs the 3940XM Extreme Edition.

Benchmarks Real world tests of Core i7 3940XM vs 3740QM

Sky Diver Data courtesy FutureMark

Cloud Gate Data courtesy FutureMark

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 3740QM
2,470,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 3940XM  vs
3740QM 
Clock speed 3 GHz 2.7 GHz
Turbo clock speed 3.9 GHz 3.7 GHz
Cores Quad core Quad core
Socket type
rPGA 988B
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
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 55W 45W
Annual home energy cost 13.25 $/year 10.84 $/year
Performance per watt 14.44 pt/W 12.25 pt/W
Typical power consumption 44.69W 36.56W

bus

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

details

Core i7 3940XM  vs
3740QM 
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 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 22 nm 22 nm
Max CPUs 1 1
Clock multiplier 30 27
Operating temperature Unknown - 105°C Unknown - 105°C

overclocking

Overclocked clock speed 4.46 GHz 3.71 GHz
Overclocked clock speed (Water) 3 GHz 2.7 GHz
Overclocked clock speed (Air) 4.46 GHz 3.71 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 3740QM
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