NVIDIA GeForce GT 640M

The NVIDIA GeForce GT 640M is a mid-range, DirectX 11.1 compatible graphics card that was announced in the first quarter of 2012 for laptops. It is a Kepler-based GPU built on the GK107 architecture and is manufactured in 28nm at TSMC. The graphics card uses a 128-Bit wide memory interface with either the more common but slower DDR3 for VRAM or the more expensive and faster GDDR5.
Architecture
The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 400M series. The GK107 Kepler core offers two shader blocks, called SMX, each with 192 shaders for a total of 384 shader cores that are clocked at the same speed as the processor core. Although more shader cores are available in the Kepler architecture as compared to the Fermi design, the Kepler shaders are still expected to be up to twice as power efficient. However, due to the missing hot clock of the shader domain, two shaders of a Kepler chip are as fast as one shader of a Fermi chip (the latter is clocked twice as fast). PCIe 3.0 is now supported by the mobile Kepler series and an optional Turbo mode can automatically overclock the Nvidia card by a theoretical 15 percent if the laptop cooling system allows it. The implementation of this boost mode is done in the BIOS, but it is ultimately dependent upon the manufacturer of the laptop.
Performance
The gaming performance of the GeForce GT 640M equipped with DDR3 graphics memory lies somewhere in the former 2011 high-end category between the older GeForce GT 555M and GeForce GTX 460M. The performance is exceptionally good in shader-heavy DirectX 11 games and benchmarks. However, the 128-Bit memory interface can be a bottleneck if DDR3 graphics memory is used. In our tests, demanding games of 2011 like Battlefield 3 are playable in 1366x768 and medium settings. Less demanding games, such as Modern Warfare 3, are easily playable with maxed out settings and high resolutions. Details on synthetic and gaming benchmarks performances of the GT 640M can be seen below. The more uncommon GDDR5 version of the GT 640M is slightly faster, getting closer to the DDR3 version of the GT 650M.
Features
The improved feature set now includes support for up to 4 active displays. Furthermore, high resolution monitors of up to 3840x2160 pixels can now be connected using DisplayPort 1.2 or HDMI 1.4a if available. HD-Audio codecs, such as Dolby TrueHD and DTS-HD, can be transmitted via bitstream mode through the HDMI port. However, as most laptops will feature Optimus, the integrated GPU will likely have direct control over the display ports and may limit the feature set available by the Nvidia Kepler cards.
The 5th generation PureVideo HD video processor (VP5) is also integrated in the GK107 core and offers hardware decoding of HD videos. Common codecs such as MPEG-1/2, MPEG-4 ASP, H.264 and VC1/WMV9 are fully supported up to 4K resolutions while VC1 and MPEG-4 are supported up to 1080p. Two streams can be decoded in parallel for features such as Picture-in-Picture. Another novelty is the inclusion of a dedicated video encoding engine similar to Intel QuickSync that can be accessed by the NVENCI API.
The power consumption of the GeForce GT 640M is a bit below that of the older GeForce GT 540M and more in line with the GT 525M. As a result, the Nvidia GPU is best suited for multimedia notebooks 14-inches or greater.
Manufacturer | NVIDIA |
GeForce GT 600M Series | |
Codename | N13P-GS |
Architecture | Kepler |
Pipelines | 384 - unified |
Core Speed | 625 - 645 (Boost) MHz |
Memory Speed | 1800 - 4000 MHz |
Memory Bus Width | 128 Bit |
Memory Type | DDR3, GDDR5 |
Max. Amount of Memory | 2048 MB |
Shared Memory | no |
DirectX | DirectX 11, Shader 5.0 |
technology | 28 nm |
Features | Optimus,
PhysX, Verde
Drivers,
CUDA, 3D
Vision, 3DTV
Play |
Notebook Size | medium sized |
Date of Announcement | 22.03.2012 |
Benchmarks
3DMark - Ice Storm Unlimited Graphics Score 1280x720 offscreen
80836 Points (15%)
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 334+ | 80836 |
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ATI Radeon HD 4850 -10%






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3DMark - Cloud Gate Standard Score 1280x720
5571 Points (10%)
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 313.96 | 5571 |
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NVIDIA GeForce GT 640M










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3DMark - Cloud Gate Standard Graphics 1280x720
9024 Points (5%)
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 313.96 | 9024 |
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NVIDIA GeForce GT 640M










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3DMark - Fire Strike Score 1920x1080
1153 Points (4%)
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 313.96 | 1153 |
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NVIDIA GeForce GT 640M










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3DMark - Fire Strike Graphics 1920x1080
1225 Points (3%)
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 313.96 | 1225 |
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NVIDIA GeForce GT 640M










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3DMark - Ice Storm Standard Graphics 1280x720
85201 Points (11%)
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 313.96 | 85201 |
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NVIDIA GeForce GT 640M










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3DMark 11 - Performance 1280x720

min: 1691 avg: 1854.9 median: 1860.5 (6%) max: 1968 points
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3DMark 11 - Performance GPU 1280x720
min: 1534 avg: 1708.3 median: 1728 (3%) max: 1778 points
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3DMark Vantage
P Result 1280x1024 +3DMark Vantage - P Result 1280x1024

min: 6648 avg: 7412.7 median: 7425 (10%) max: 8551 Points
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P GPU no PhysX 1280x1024 +3DMark Vantage - P GPU no PhysX 1280x1024

min: 5773 avg: 6577.9 median: 6348 (8%) max: 7440 Points
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3DMark 2001SE - Standard 1024x768
12955 Points (13%)
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NVIDIA GeForce GT 640M










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3DMark 03 - Standard 1024x768

min: 28232 avg: 29495 median: 29298.5 (15%) max: 31151 Points
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3DMark 05 - Standard 1024x768

min: 15287 avg: 17104.8 median: 16784 (36%) max: 19564 Points
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3DMark 06 Standard 1280x1024 +3DMark 06

min: 10001 avg: 11136.4 median: 10625.5 (23%) max: 12843 Points
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Unigine Heaven 2.1 - high, Tesselation (normal), DirectX11 1280x1024
min: 22.5 avg: 23.9 median: 23.5 (10%) max: 26 fps
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ATI Radeon HD 5670 -4%



NVIDIA GeForce GT 640M










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SPECviewperf 11
Siemens NX 1920x1080 +SPECviewperf 11 - Siemens NX 1920x1080
min: 2.48 avg: 2.5 median: 2.5 (2%) max: 2.6 fps
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 296.11 | 2.48 |
Dell XPS 15 (L521x) PL | 3612QM | 8192 MB | | 2048MB ForceWare 96.01 | 2.6 |
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Tcvis 1920x1080 +SPECviewperf 11 - Tcvis 1920x1080
min: 0.71 avg: 0.8 median: 0.8 (1%) max: 0.82 fps
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 296.11 | 0.71 |
Dell XPS 15 (L521x) PL | 3612QM | 8192 MB | | 2048MB ForceWare 96.01 | 0.82 |
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NVIDIA GeForce GT 640M










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SolidWorks 1920x1080 +SPECviewperf 11 - SolidWorks 1920x1080

min: 5.97 avg: 6.6 median: 6.6 (8%) max: 7.17 fps
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 296.11 | 5.97 |
Dell XPS 15 (L521x) PL | 3612QM | 8192 MB | | 2048MB ForceWare 96.01 | 7.17 |

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Pro/ENGINEER 1920x1080 +SPECviewperf 11 - Pro/ENGINEER 1920x1080

min: 1.07 avg: 1.7 median: 1.7 (7%) max: 2.23 fps
Dell XPS 15 (L521x) PL | 3612QM | 8192 MB | | 2048MB ForceWare 96.01 | 1.07 |
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 296.11 | 2.23 |
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Maya 1920x1080 +SPECviewperf 11 - Maya 1920x1080

min: 8.97 avg: 9.9 median: 9.9 (7%) max: 10.86 fps
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 296.11 | 8.97 |
Dell XPS 15 (L521x) PL | 3612QM | 8192 MB | | 2048MB ForceWare 96.01 | 10.86 |
NVIDIA GeForce GTX 580 -85%

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Lightwave 1920x1080 +SPECviewperf 11 - Lightwave 1920x1080

min: 9.11 avg: 11.8 median: 11.8 (13%) max: 14.44 fps
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 296.11 | 9.11 |
Dell XPS 15 (L521x) PL | 3612QM | 8192 MB | | 2048MB ForceWare 96.01 | 14.44 |

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Ensight 1920x1080 +SPECviewperf 11 - Ensight 1920x1080

min: 18.15 avg: 18.3 median: 18.3 (9%) max: 18.39 fps
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 296.11 | 18.15 |
Dell XPS 15 (L521x) PL | 3612QM | 8192 MB | | 2048MB ForceWare 96.01 | 18.39 |
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Catia 1920x1080 +SPECviewperf 11 - Catia 1920x1080
min: 6.75 avg: 7 median: 6.9 (8%) max: 7.14 fps
Dell XPS 15 (L521x) PL | 3612QM | 8192 MB | | 2048MB ForceWare 96.01 | 6.75 |
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 296.11 | 7.14 |
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NVIDIA GeForce GT 640M










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Windows 7 Experience Index - Gaming graphics

min: 6.7 avg: 6.9 median: 6.9 (87%) max: 7 points
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Windows 7 Experience Index - Graphics

min: 4.6 avg: 6.3 median: 6.9 (87%) max: 7 points

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Cinebench R10 Shading 32Bit +Cinebench R10 - Shading 32Bit

min: 4578 avg: 5741.4 median: 5635 (28%) max: 7081 Points
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Cinebench R11.5 OpenGL 64Bit +Cinebench R11.5 - OpenGL 64Bit

min: 32.37 avg: 37.5 median: 37.6 (22%) max: 41.86 Points
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NVIDIA GeForce GTX 560 Ti -4%



















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Cinebench R15
OpenGL 64Bit +Cinebench R15 - OpenGL 64Bit
42.4 Points (17%)
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 331.40 | 42.42 |
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NVIDIA GeForce GT 640M










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Ref. Match 64Bit +Cinebench R15 - Ref. Match 64Bit

99.6 Points (100%)
Acer Aspire M3-581TG | 2637M | 4096 MB | 709 / 900 MHz | 1024MB DDR3 331.40 | 99.6 |

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LuxMark v2.0 64Bit - Room GPUs-only
47 Samples/s (1%)
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LuxMark v2.0 64Bit - Sala GPUs-only
101 Samples/s (1%)
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NVIDIA GeForce GT 640M










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ComputeMark v2.1 - Normal, Score 1024x600
1114 Points (4%)
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NVIDIA GeForce GT 640M










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Power Consumption - FurMark 1.19 GPU Stress Test - Power Consumption (external Monitor) 1280x720 *

57 Watt (15%)
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Power Consumption - The Witcher 3 Power Consumption (external Monitor) ultra 1920x1080 *

42.2 Watt (10%)
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Clock Speed - GPU Clock Witcher 3 ultra

709 MHz (17%)
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Clock Speed - GPU Clock Speed Furmark 1.19 GPU Stress Test 1280x720

540 MHz (32%)
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- Range of benchmark values for this graphics card

- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance
Game Benchmarks
The following benchmarks stem from our benchmarks of review laptops. The performance depends on the used graphics memory, clock rate, processor, system settings, drivers, and operating systems. So the results don't have to be representative for all laptops with this GPU. For detailled information on the benchmark results, click on the fps number.



















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» With all tested laptops playable in detail settings med..
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» The benchmarks indicate that the game is not playable in the tested settings.
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» With all tested laptops playable in detail settings med..



















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