Intel Core i7-3940XM

Intel 3940XM

The Intel Core i7-3940XM is the fastest quad-core processor for laptops (at the time of introduction in September 2012) an successor of the i7-3920XM. Due to Hyperthreading, the four cores can handle up to eight threads in parallel leading to better utilization of the CPU. Each core offers a base speed of 3.0 GHz but can dynamically increase clock rates with Turbo Boost up to 3.7 GHz (for 4 active cores), 3.8 GHz (for 2 active cores) and 3.9 GHz (for 1 active core). Furthermore, the Extreme CPUs offer an unlocked multiplicator for easy overclocking.

Ivy Bridge is an enhanced die shrink of the Sandy Bridge architecture with improvements on both GPU and CPU performance. The CPUs are produced in 22nm (versus 32nm Sandy Bridge CPUs) and are the first to introduce 3D transistors for increased energy efficiency when compared to similarly clocked Sandy Bridge processors. Other new features are integrated PCI Express 3.0 and  DDR3(L)-1600 support.

The performance of the Core i7-3940XM should be slightly above a similarly clocked Sandy Bridge processor due to slight architectural improvements. Because of the higher clock speed, the former champion Core i7-3920XM should be outperformed by about 3%.

The integrated Intel HD Graphics 4000 offers 16 Execution Units (EUs) clocked at 650 MHz up to 1350 MHz with Turbo Boost, making it the fastest variant.

The XM CPUs are rated at a TDP of 55 Watts including graphics card and memory controller and therefore 10 Watt higher than the other quad-core models.  Therefore, the CPU is well-suited for laptops 17-inches or greater.

SeriesIntel Core i7
CodenameIvy Bridge
Clock Rate3000 - 3900 MHz
Level 1 Cache256 KB
Level 2 Cache1024 KB
Level 3 Cache8192 KB
Number of Cores / Threads4 / 8
Max. Power Consumption (TDP = Thermal Design Power)55 Watt
Transistor Count1400 Million
Manufacturing Technology22 nm
Die Size160 mm2
Max. Temperature105 °C
SocketFCPGA988
FeaturesHD Graphics 4000, DDR3(L)-1600 Memory Controller, HyperThreading, AVX, Quick Sync, Virtualization
64 Bit64 Bit support
Hardware VirtualizationVT-x, VT-d
Starting Price $1096 U.S.
Announcement Date09/30/2012

CPU Benchmarks

3DMark (2013): Fire Strike Standard Physics 1920x1080
0% 100%
min: 9863     avg: 9863 (59.25%)     max: 9863 Points
3DMark (2013): Cloud Gate Standard Physics 1280x720
0% 100%
min: 7208     avg: 7208 (65.62%)     max: 7208 Points
3DMark (2013): Ice Storm Standard Physics 1280x720
0% 100%
min: 48410     avg: 48410 (89.42%)     max: 48410 Points
TrueCrypt: Serpent Mean 100MB
0% 100%
min: 0.373     avg: 0.4 (0.29%)     max: 0.386 GB/s
TrueCrypt: Twofish Mean 100MB
0% 100%
min: 0.64     avg: 0.7 (0.32%)     max: 0.66 GB/s
TrueCrypt: AES Mean 100MB
0% 100%
min: 3.5     avg: 3.6 (0.4%)     max: 3.7 GB/s
X264 HD Benchmark 4.0: Pass 2
0% 100%
min: 40.6     avg: 40.6 (46.49%)     max: 40.6 fps
X264 HD Benchmark 4.0: Pass 1
0% 100%
min: 161.08     avg: 161.1 (91.68%)     max: 161.08 fps
WinRAR: Result
0% 100%
min: 3467     avg: 4123.5 (56.72%)     max: 4780 KB/s
wPrime 2.0x: 1024m
0% 100%
min: 208.8     avg: 219.2 (98.93%)     max: 233 seconds*
wPrime 2.0x: 32m
0% 100%
min: 6.8     avg: 7 (99.51%)     max: 7.169 seconds*
3DMark 11: Performance Physics 1280x720
0% 100%
min: 7611     avg: 8737 (66.1%)     max: 9568 points
3DMark Vantage: P CPU no PhysX 1280x1024
0% 100%
min: 25344     avg: 25795.3 (64.51%)     max: 26157 Points
3DMark 06 - CPU:
0% 100%
min: 7166     avg: 7181.7 (80.77%)     max: 7203 Points
Cinebench R11.5: CPU Single 64Bit
0% 100%
min: 1.62     avg: 1.6 (57.21%)     max: 1.63 Points
Cinebench R11.5: CPU Multi 64Bit
0% 100%
min: 7.45     avg: 7.5 (41.62%)     max: 7.46 Points
Cinebench R10: Rendering Single CPUs 64Bit
0% 100%
min: 6506     avg: 6620.7 (26.68%)     max: 6687 Points
Cinebench R10: Rendering Multiple CPUs 64Bit
0% 100%
min: 25475     avg: 25599.7 (71.26%)     max: 25700 Points
Cinebench R10: Rendering Single 32Bit
0% 100%
min: 5246     avg: 5255 (78.41%)     max: 5267 Points
Cinebench R10: Rendering Multiple CPUs 32Bit
0% 100%
min: 20438     avg: 20582 (59.18%)     max: 20744 Points
Super Pi mod 1.5 XS 1M:
0% 100%
min: 9     avg: 9.2 (99.96%)     max: 9.554 Seconds*
Super Pi mod 1.5 XS 2M:
0% 100%
min: 21     avg: 21.1 (99.99%)     max: 21.256 Seconds*
Super Pi Mod 1.5 XS 32M:
0% 100%
min: 518     avg: 525.5 (97.72%)     max: 533 Seconds*
SiSoft Sandra Dhrystone (MIPS):
0% 100%
min: 147240     avg: 147620 (70.06%)     max: 148000 MIPS
SiSoft Sandra Whetstone (MFLOPS):
0% 100%
min: 89600     avg: 89630 (68.76%)     max: 89660 MFLOPS
Windows 7 Experience Index: Processor
0% 100%
min: 7.7     avg: 7.7 (98.41%)     max: 7.7 points
- Range of benchmarks for this CPU
- Average benchmark score

Cinebench R10 in comparison
Intel Atom Z670 (min)
691 
...
Intel Xeon (Desktop) X5670
19954 
Intel Core i7 4900MQ
20036.4 
Intel Core i7 3840QM
20135 
Intel Core i7 3940XM
20582 
Intel Core i7 4930MX
20851.8 
Intel Core i7 (Desktop) 3770K
22190 
Intel Core i7 (Desktop) 990X EE
22268.7 
...
Intel Xeon (Desktop) E5-2697 v2 (max)
34776 

Reviews for the Intel Core i7 3940XM processor

Dell Precision M6700 (NVIDIA Quadro K5000M, 17.3")
» Review Update Dell Precision M6700 Notebook Nvidia Quadro K5000M - Review

Origin PC EON17-SLX (NVIDIA GeForce GTX 680M SLI, 17.3")
» Origin PC EON17-SLX - External Review

» Mobile CPU Comparison
Comparison of all mobile CPU series

» Mobile Processors - Benchmarklist
Benchmarklist of all known CPUs that are used in laptops (desktop and laptop CPUs)

Other CPUs of the series Intel Core i7

» Intel Core i7 4940MX
   3.1 GHz / 1 MB + 8 MB
» Intel Core i7 4930MX
   3 GHz / 1 MB + 8 MB
» Intel Core i7 4910MQ
   2.9 GHz / 1 MB + 8 MB
» Intel Core i7 3940XM
   3 GHz / 1 MB + 8 MB
» Intel Core i7 4900MQ
   2.8 GHz / 1 MB + 8 MB
» Intel Core i7 4960HQ
   2.6 GHz / 1 MB + 6 MB
» Intel Core i7 4810MQ
   2.8 GHz / 1 MB + 6 MB
» Intel Core i7 3920XM
   2.9 GHz / 1 MB + 8 MB
» Intel Core i7 4800MQ
   2.7 GHz / 1 MB + 6 MB
» Intel Core i7 4950HQ
   2.4 GHz / 1 MB + 6 MB
» Intel Core i7 4860HQ
   2.4 GHz / 1 MB + 6 MB
» Intel Core i7 3840QM
   2.8 GHz / 1 MB + 8 MB
» Intel Core i7 4850HQ
   2.3 GHz / 1 MB + 6 MB
» Intel Core i7 4710HQ
   2.5 GHz / 1 MB + 6 MB
» Intel Core i7 4710MQ
   2.5 GHz / 1 MB + 6 MB
» Intel Core i7 3820QM
   2.7 GHz / 1 MB + 8 MB
» Intel Core i7 3740QM
   2.7 GHz / 1 MB + 6 MB
» Intel Core i7 3720QM
   2.6 GHz / 1 MB + 6 MB
» Intel Core i7 4700HQ
   2.4 GHz / 1 MB + 6 MB
» Intel Core i7 4700MQ
   2.4 GHz / 1 MB + 6 MB
» Intel Core i7 4760HQ
   2.1 GHz / 1 MB + 6 MB
» Intel Core i7 2960XM
   2.7 GHz / 1 MB + 8 MB
» Intel Core i7 4712HQ
   2.3 GHz / 1 MB + 6 MB
» Intel Core i7 4712MQ
   2.3 GHz / 1 MB + 6 MB
» Intel Core i7 4750HQ
   2 GHz / 1 MB + 6 MB
» Intel Core i7 3635QM
   2.4 GHz / 1 MB + 6 MB
» Intel Core i7 3630QM
   2.4 GHz / 1 MB + 6 MB
» Intel Core i7 4702HQ
   2.2 GHz / 1 MB + 6 MB
» Intel Core i7 4702MQ
   2.2 GHz / 1 MB + 6 MB
» Intel Core i7 2860QM
   2.5 GHz / 1 MB + 8 MB
» Intel Core i7 2920XM
   2.5 GHz / 1 MB + 8 MB
» Intel Core i7 3615QM
   2.3 GHz / 1 MB + 6 MB
» Intel Core i7 3610QM
   2.3 GHz / 1 MB + 6 MB
» Intel Core i7 3632QM
   2.2 GHz / 1 MB + 6 MB
» Intel Core i7 2760QM
   2.4 GHz / 1 MB + 6 MB
» Intel Core i7 2820QM
   2.3 GHz / 1 MB + 8 MB
» Intel Core i7 3612QM
   2.1 GHz / 1 MB + 6 MB
» Intel Core i7 2720QM
   2.2 GHz / 1 MB + 6 MB
» Intel Core i7 2675QM
   2.2 GHz / 1 MB + 6 MB
» Intel Core i7 2670QM
   2.2 GHz / 1 MB + 6 MB
» Intel Core i7 2635QM
   2 GHz / 1 MB + 6 MB
» Intel Core i7 2630QM
   2 GHz / 1 MB + 6 MB
» Intel Core i7 4610M
   3 GHz / 0.5 MB + 4 MB
» Intel Core i7 940XM
   2.13 GHz / 1 MB + 8 MB
» Intel Core i7 4600M
   2.9 GHz / 0.5 MB + 4 MB
» Intel Core i7 920XM
   2 GHz / 1 MB + 8 MB
» Intel Core i7 3540M
   3 GHz / 0.5 MB + 4 MB
» Intel Core i7 4558U
   2.8 GHz / 0.5 MB + 4 MB
» Intel Core i7 3520M
   2.9 GHz / 0.5 MB + 4 MB
» Intel Core i7 2640M
   2.8 GHz / 0.5 MB + 4 MB
» Intel Core i7 840QM
   1.86 GHz / 1 MB + 8 MB
» Intel Core i7 2620M
   2.7 GHz / 0.5 MB + 4 MB
» Intel Core i7 4600U
   2.1 GHz / 0.5 MB + 4 MB
» Intel Core i7 4650U
   1.7 GHz / 0.5 MB + 4 MB
» Intel Core i7 3687U
   2.1 GHz / 0.5 MB + 4 MB
» Intel Core i7 4510U
   2 GHz / 0.5 MB + 4 MB
» Intel Core i7 640M
   2.8 GHz / 0.5 MB + 4 MB
» Intel Core i7 820QM
   1.73 GHz / 1 MB + 8 MB
» Intel Core i7 3667U
   2 GHz / 0.5 MB + 4 MB
» Intel Core i7 4500U
   1.8 GHz / 0.5 MB + 4 MB
» Intel Core i7 4550U
   1.5 GHz / 0.5 MB + 4 MB
» Intel Core i7 740QM
   1.73 GHz / 1 MB + 6 MB
» Intel Core i7 3537U
   2 GHz / 0.5 MB + 4 MB
» Intel Core i7 3517U
   1.9 GHz / 0.5 MB + 4 MB
» Intel Core i7 620M
   2.66 GHz / 0.5 MB + 4 MB
» Intel Core i7 720QM
   1.6 GHz / 1 MB + 6 MB
» Intel Core i7 2649M
   2.3 GHz / 0.5 MB + 4 MB
» Intel Core i7 4610Y
   1.7 GHz / 0.5 MB + 4 MB
» Intel Core i7 2629M
   2.1 GHz / 0.5 MB + 4 MB
» Intel Core i7 2677M
   1.8 GHz / 0.5 MB + 4 MB
» Intel Core i7 660LM
   2.27 GHz / 0.5 MB + 4 MB
» Intel Core i7 2637M
   1.7 GHz / 0.5 MB + 4 MB
» Intel Core i7 2657M
   1.6 GHz / 0.5 MB + 4 MB
» Intel Core i7 3689Y
   1.5 GHz / 0.5 MB + 4 MB
» Intel Core i7 2617M
   1.5 GHz / 0.5 MB + 4 MB
» Intel Core i7 640LM
   2.13 GHz / 0.5 MB + 4 MB
» Intel Core i7 620LM
   2 GHz / 0.5 MB + 4 MB
» Intel Core i7 680UM
   1.47 GHz / 0.5 MB + 4 MB
» Intel Core i7 660UM
   1.33 GHz / 0.5 MB + 4 MB
» Intel Core i7 640UM
   1.2 GHz / 0.5 MB + 4 MB
» Intel Core i7 620UM
   1.06 GHz / 0.5 MB + 4 MB

Surrounding CPUs

- Intel Core i7 (Desktop) 980X EE
   3.33 GHz / 1.5 MB + 12 MB
- Intel Core i7 4930MX
   3 GHz / 1 MB + 8 MB
- Intel Core i7 4910MQ
   2.9 GHz / 1 MB + 8 MB
- Intel Core i7 (Desktop) 3770K
   3.5 GHz / 1 MB + 8 MB
- Intel Core i7 (Desktop) 3770
   3.4 GHz / 0 MB + 8 MB
» Intel Core i7 3940XM
   3 GHz / 1 MB + 8 MB
+ Intel Core i7 4900MQ
   2.8 GHz / 1024 KB + 8192 KB
+ Intel Core i7 4960HQ
   2.6 GHz / 1024 KB + 6144 KB
+ Intel Core i7 4810MQ
   2.8 GHz / 1024 KB + 6144 KB
+ Intel Core i7 3920XM
   2.9 GHz / 1024 KB + 8192 KB
+ Intel Core i7 4800MQ
   2.7 GHz / 1024 KB + 6144 KB
> Notebook / Laptop Reviews and News > FAQ / Tips / Technics > Notebook Processors > Intel Core i7 > Intel Core i7 3940XM Notebook Processor
Author: Klaus Hinum, 2012-08-14 (Update: 2012-08-14)