Notebookcheck

NVIDIA GeForce GT 640M LE

NVIDIA GeForce GT 640M LE

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 640MWatch 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.

ManufacturerNVIDIA
GeForce GT 600M Series
GeForce GT 650M SLI compare 768 @ 0.79 - 0.84 GHz2x 128 Bit @ 4000 MHz
GeForce GT 650M compare 384 @ 0.74 - 0.9 GHz128 Bit @ 1800 - 4000 MHz
GeForce GT 645M compare 384 @ 0.71 GHz128 Bit @ 1800 MHz
GeForce GT 640M compare 384 @ 0.63 - 0.65 GHz128 Bit @ 1800 - 4000 MHz
GeForce GT 640M LE 384 @ 0.5 GHz128 Bit @ 1800 - 4000 MHz
GeForce GT 635M compare 144 @ 0.66 - 0.75 GHz128/192 Bit @ 1800 MHz
GeForce GT 630M compare 96 @ 0.67 GHz128 Bit @ 1800 MHz
GeForce GT 625M compare 96 @ 0.63 GHz64 Bit @ 1800 MHz
GeForce GT 620M compare 96 @ 0.63 - 0.72 GHz64 / 128 Bit @ 1800 MHz
CodenameN13P-LP
ArchitectureFermi / Kepler
Pipelines384 - unified
Core Speed500 MHz
Memory Speed1800 - 4000 MHz
Memory Bus Width128 Bit
Memory TypeDDR3, GDDR5
Max. Amount of Memory2048 MB
Shared Memoryno
DirectXDirectX 11, Shader 5.0
technology28 nm
FeaturesOptimus, PhysX, Verde Drivers, CUDA, 3D Vision, 3DTV Play
Notebook Sizemedium sized
Date of Announcement22.03.2012

Benchmarks

3DMark Vantage
3DM Vant. Perf. total +
3DM Vant. Perf. GPU no PhysX +
3DMark 06 3DMark 06 - Standard 1366x768 +
3DMark 06 - Standard 1280x1024 +
3DMark 06 - Standard 1024x768 +
Cinebench R10 Cinebench R10 Shading (32bit) +
Cinebench R11.5 Cinebench R11.5 OpenGL 64 Bit +
- 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.

low 1024x768
33.3  fps    + Compare
med. 1366x768
30.9  fps    + Compare
high 1366x768
13.3  fps    + Compare
ultra 1920x1080
10.4  fps    + Compare
» The benchmarks indicate that the game is not playable in the tested settings.
low 1024x768
73.8  fps    + Compare
med. 1366x768
55.1  fps    + Compare
high 1366x768
36.1  fps    + Compare
ultra 1920x1080
13.4  fps    + Compare
» With all tested laptops playable in detail settings high.
low 1024x768
98.6  fps    + Compare
med. 1366x768
65.3  fps    + Compare
high 1366x768
57.7  fps    + Compare
ultra 1920x1080
42.5  fps    + Compare
» With all tested laptops playable in detail settings ultra.
low 1024x768
39.1  fps    + Compare
med. 1366x768
25.1  fps    + Compare
high 1366x768
20.3  fps    + Compare
ultra 1920x1080
10.3  fps    + Compare
» With all tested laptops playable in detail settings low.
low 1280x720
60  fps    + Compare
high 1366x768
39.1  fps    + Compare
ultra 1920x1080
26.4  fps    + Compare
» With all tested laptops playable in detail settings high.
Alan Wake

Alan Wake

2012
low 1024x768
42  fps    + Compare
med. 1366x768
25.2  fps    + Compare
ultra 1920x1080
11.2  fps    + Compare
» With all tested laptops playable in detail settings low.
Anno 2070

Anno 2070

2011
low 1024x768
55 90.4 ~ 73 fps    + Compare
med. 1366x768
30 40.5 ~ 35 fps    + Compare
high 1366x768
19 25.1 ~ 22 fps    + Compare
ultra 1920x1080
13.4  fps    + Compare
» With all tested laptops playable in detail settings low.
low 1280x720
31 45.7 47 48.4 49.2 ~ 44 fps    + Compare
med. 1366x768
23 34.3 34.7 38 40.5 ~ 34 fps    + Compare
high 1366x768
17 26.3 26.3 28 31.6 ~ 26 fps    + Compare
ultra 1920x1080
12.9 14.5 18.6 ~ 15 fps    + Compare
» With most tested laptops playable in detail settings low.
low 1024x768
38.1 41 ~ 40 fps    + Compare
med. 1366x768
24.6 28 ~ 26 fps    + Compare
high 1366x768
20.3 22 ~ 21 fps    + Compare
ultra 1920x1080
8.9  fps    + Compare
» With all tested laptops playable in detail settings low.
Fifa 12

Fifa 12

2011
low 800x600
308.1  fps    + Compare
med. 1024x768
171  fps    + Compare
high 1360x768
126.2  fps    + Compare
ultra 1920x1080
82.7  fps    + Compare
» With all tested laptops playable in detail settings ultra.
F1 2011

F1 2011

2011
low 800x600
91 105 ~ 98 fps    + Compare
med. 1024x768
66 70 ~ 68 fps    + Compare
high 1366x768
48 55 ~ 52 fps    + Compare
ultra 1920x1080
17  fps    + Compare
» With all tested laptops playable in detail settings high.
low 1024x768
59 60 60 89.3 ~ 67 fps    + Compare
high 1366x768
46 47 49 51.8 ~ 48 fps    + Compare
ultra 1920x1080
17.4 19 19.1 ~ 19 fps    + Compare
» With all tested laptops playable in detail settings high.
Dirt 3

Dirt 3

2011
low 800x600
144.4  fps    + Compare
med. 1024x768
70.4  fps    + Compare
high 1360x768
51.1  fps    + Compare
ultra 1920x1080
16.8  fps    + Compare
» With all tested laptops playable in detail settings high.
low 1024x768
124 184.9 261.2 ~ 190 fps    + Compare
med. 1360x768
53 55.7 58.2 ~ 56 fps    + Compare
high 1360x768
37 37.7 45 ~ 40 fps    + Compare
ultra 1920x1080
21.1 26.6 ~ 24 fps    + Compare
» With all tested laptops playable in detail settings high.
low 800x600
58.4  fps    + Compare
med. 1360x768
37.5  fps    + Compare
high 1600x900
19.1  fps    + Compare
ultra 1920x1080
6.6  fps    + Compare
» With all tested laptops playable in detail settings med..
World of Warcraft

World of Warcraft

2005
low 800x600
78  fps    + Compare