The NVIDIA GeForce GT 640M LE is a mid-range, DirectX 11.1 compatible graphics card that was announced in the first quarter of 2012 for thin-and-light-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 DDR3-VRAM. A slower core clock of only 500 MHz differs the LE-model from a normal GT 640M. Watch out: Following rumors, there will also be a Fermi-based version (96 shaders, 762 MHz, DDR3/GDDR5, similar to 550M/555M) with a probably higher power consumption than the Kepler variant.
Architecture
The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 500M 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
Due to a clock speed of just 500 MHz, the gaming performance of the GeForce GT 640M LE is about 20 percent below the 640M. This is the same level as the GT 635M or the GT 555M. 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. Demanding games of 2011 like Battlefield 3 are playable in 1366x768 and medium settings.
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 NVENC API.
The power consumption of the GeForce GT 640M LE is similar to the older GeForce GT 520M. As a result, the Nvidia GPU is suited for thin-and-light laptops.
GeForce GT 600M Series
| ||||||||||||||||||||||||||||
| Codename | N13P-LP | |||||||||||||||||||||||||||
| Architecture | Fermi / Kepler | |||||||||||||||||||||||||||
| Pipelines | 384 - unified | |||||||||||||||||||||||||||
| Core Speed | 500 MHz | |||||||||||||||||||||||||||
| Memory Speed | 1800 - 4000 MHz | |||||||||||||||||||||||||||
| Memory Bus Width | 128 Bit | |||||||||||||||||||||||||||
| Memory Type | DDR3, GDDR5 | |||||||||||||||||||||||||||
| Max. Amount of Memory | 2048 MB | |||||||||||||||||||||||||||
| Shared Memory | no | |||||||||||||||||||||||||||
| API | DirectX 11, Shader 5.0 | |||||||||||||||||||||||||||
| Man. Technology | 28 nm | |||||||||||||||||||||||||||
| Features | Optimus, PhysX, Verde Drivers, CUDA, 3D Vision, 3DTV Play | |||||||||||||||||||||||||||
| Notebook Size | medium sized | |||||||||||||||||||||||||||
| Date of Announcement | 22.03.2012 | |||||||||||||||||||||||||||
- Average benchmark valuesThe 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.
| low | med. | high | ultra | QHD | 4K | |
|---|---|---|---|---|---|---|
| Guild Wars 2 | 51 | 26 | ||||
| Max Payne 3 | 33.3 | 30.9 | 13.3 | 10.4 | ||
| Dirt Showdown | 73.8 | 55.1 | 36.1 | 13.4 | ||
| Diablo III | 98.6 | 65.3 | 57.7 | 42.5 | ||
| Risen 2: Dark Waters | 39.1 | 25.1 | 20.3 | 10.3 | ||
| Mass Effect 3 | 60 | 39.1 | 26.4 | |||
| Alan Wake | 42 | 25.2 | 11.2 | |||
| Anno 2070 | 73 | 35 | 22 | 13.4 | ||
| The Elder Scrolls V: Skyrim | 44 | 34 | 26 | 15 | ||
| Battlefield 3 | 40 | 26 | 21 | 8.9 | ||
| Fifa 12 | 308.1 | 171 | 126.2 | 82.7 | ||
| F1 2011 | 98 | 68 | 52 | 17 | ||
| Deus Ex Human Revolution | 67 | 48 | 19 | |||
| Dirt 3 | 144.4 | 70.4 | 51.1 | 16.8 | ||
| StarCraft 2 | 190 | 56 | 40 | 24 | ||
| Metro 2033 | 58.4 | 37.5 | 19.1 | 6.6 | ||
| World of Warcraft | 78 | 53 | 26 | |||
| low | med. | high | ultra | QHD | 4K | < 30 fps < 60 fps < 120 fps ≥ 120 fps | 7 7 3 | 3 7 3 1 | 8 7 1 | 13 1 1 | | |
For more games that might be playable and a list of all games and graphics cards visit our Gaming List
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» Comparison of GPUs
Detailed list of all laptop GPUs sorted by class and performance.
» Benchmark List
Sort and restrict laptop GPUs based on performance in synthetic benchmarks.
» Notebook Gaming List
Playable games for each graphics card and their average FPS results.
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