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
Performance Rating - 3DMark 11 + Fire Strike + Time Spy
8 pt (8%)
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3DMark - 3DMark Ice Storm Unlimited Graphics
80836 Points (13%)
Acer Aspire M3-581TG | 2637M | 4 GB | 709 / 900 MHz | 1 GB | 80836 |
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ATI Radeon HD 4850 -10%
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3DMark - 3DMark Cloud Gate Score
5571 Points (7%)
Acer Aspire M3-581TG | 2637M | 4 GB | 709 / 900 MHz | 1 GB | 5571 |
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3DMark - 3DMark Cloud Gate Graphics
9024 Points (4%)
Acer Aspire M3-581TG | 2637M | 4 GB | 709 / 900 MHz | 1 GB | 9024 |
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3DMark - 3DMark Fire Strike Standard Score
1153 Points (3%)
Acer Aspire M3-581TG | 2637M | 4 GB | 709 / 900 MHz | 1 GB | 1153 |
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3DMark - 3DMark Fire Strike Standard Graphics
1225 Points (2%)
Acer Aspire M3-581TG | 2637M | 4 GB | 709 / 900 MHz | 1 GB | 1225 |
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3DMark - 3DMark Ice Storm Graphics
85201 Points (11%)
Acer Aspire M3-581TG | 2637M | 4 GB | 709 / 900 MHz | 1 GB | 85201 |
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3DMark 11 - 3DM11 Performance Score
min: 1691 avg: 1855 median: 1860.5 (4%) max: 1968 Points
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3DMark 11 - 3DM11 Performance GPU
min: 1534 avg: 1708 median: 1728 (3%) max: 1778 Points
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3DMark Vantage
3DM Vant. Perf. total +3DMark Vantage - 3DM Vant. Perf. total
min: 6648 avg: 7413 median: 7425 (7%) max: 8551 Points
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3DM Vant. Perf. GPU no PhysX +3DMark Vantage - 3DM Vant. Perf. GPU no PhysX
min: 5773 avg: 6578 median: 6348 (6%) max: 7440 Points
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3DMark 2001SE - 3DMark 2001 - Standard
12955 Points (13%)
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3DMark 03 - 3DMark 03 - Standard
min: 28232 avg: 29495 median: 29298.5 (15%) max: 31151 Points
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3DMark 05 - 3DMark 05 - Standard
min: 15287 avg: 17105 median: 16784 (24%) max: 19564 Points
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3DMark 06 3DMark 06 - Standard 1280x1024 +min: 10001 avg: 11136 median: 10625.5 (20%) max: 12843 Points
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Unigine Heaven 2.1 - Heaven 2.1 high
min: 22.5 avg: 23.9 median: 23.5 (4%) max: 26 fps
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ATI Radeon HD 5670 -4%
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SPECviewperf 11
specvp11 snx-01 +SPECviewperf 11 - specvp11 snx-01
min: 2.48 avg: 2.5 median: 2.5 (2%) max: 2.6 fps
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specvp11 tcvis-02 +SPECviewperf 11 - specvp11 tcvis-02
min: 0.71 avg: 0.8 median: 0.8 (1%) max: 0.82 fps
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specvp11 sw-02 +SPECviewperf 11 - specvp11 sw-02
min: 5.97 avg: 6.6 median: 6.6 (8%) max: 7.17 fps
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specvp11 proe-05 +SPECviewperf 11 - specvp11 proe-05
min: 1.07 avg: 1.7 median: 1.7 (7%) max: 2.23 fps
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specvp11 maya-03 +SPECviewperf 11 - specvp11 maya-03
min: 8.97 avg: 9.9 median: 9.9 (7%) max: 10.86 fps
NVIDIA GeForce GTX 580 -85%
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specvp11 lightwave-01 +SPECviewperf 11 - specvp11 lightwave-01
min: 9.11 avg: 11.8 median: 11.8 (13%) max: 14.44 fps
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specvp11 ensight-04 +SPECviewperf 11 - specvp11 ensight-04
min: 18.15 avg: 18.3 median: 18.3 (9%) max: 18.39 fps
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specvp11 catia-03 +SPECviewperf 11 - specvp11 catia-03
min: 6.75 avg: 7 median: 6.9 (8%) max: 7.14 fps
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Windows 7 Experience Index - Win7 Gaming graphics
min: 6.7 avg: 6.9 median: 6.9 (87%) max: 7 Points
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Windows 7 Experience Index - Win7 Graphics
min: 4.6 avg: 6.3 median: 6.9 (87%) max: 7 Points
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Cinebench R10 Cinebench R10 Shading (32bit) +Cinebench R10 - Cinebench R10 Shading (32bit)
min: 4578 avg: 5741 median: 5635 (27%) max: 7081 points
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Cinebench R11.5 Cinebench R11.5 OpenGL 64 Bit +Cinebench R11.5 - Cinebench R11.5 OpenGL 64 Bit
min: 32.37 avg: 37.4 median: 37.6 (17%) max: 41.86 fps
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Cinebench R15
Cinebench R15 OpenGL 64 Bit +Cinebench R15 - Cinebench R15 OpenGL 64 Bit
42.4 fps (12%)
Acer Aspire M3-581TG | 2637M | 4 GB | 709 / 900 MHz | 1 GB | 42.42 |
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Cinebench R15 OpenGL Ref. Match 64 Bit +Cinebench R15 - Cinebench R15 OpenGL Ref. Match 64 Bit
99.6 % (100%)
Acer Aspire M3-581TG | 2637M | 4 GB | 709 / 900 MHz | 1 GB | 99.6 |
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LuxMark v2.0 64Bit - LuxMark v2.0 Room GPU
47 Samples/s (0%)
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LuxMark v2.0 64Bit - LuxMark v2.0 Sala GPU
101 Samples/s (0%)
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ComputeMark v2.1 - ComputeMark v2.1 Result
1114 points (2%)
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Power Consumption - Furmark Stress Test Power Consumption - external Monitor *
57 Watt (10%)
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Power Consumption - The Witcher 3 Power Consumption - external Monitor *
42.2 Watt (7%)
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Clock Speed - GPU Clock Witcher 3 ultra
709 MHz (37%)
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Clock Speed - GPU Clock Speed Furmark
540 MHz (27%)
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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 detailed information on the benchmark results, click on the fps number.
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» With all tested laptops playable in detail settings low.
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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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» 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 low.
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» The benchmarks indicate that the game is not playable in the tested settings.
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» The benchmarks indicate that the game is not playable in the tested settings.
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56 (!) [X] Acer Aspire M3-581TGIntel Core i7-2637M 1.7GHz
GeForce GT 640M
Problem during benchmarking occured: slowdownsmin:
46 fps, max:
65 fps
fps
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» With all tested laptops playable in detail settings ultra.
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» With all tested laptops playable in detail settings low.
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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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» The benchmarks indicate that the game is not playable in the tested settings.
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