NVIDIA GeForce GTX 680MX
The NVIDIA GeForce GTX 680MX is a high-end DirectX 11.1-compatible graphics card for Apples iMac. It has a 28nm GK104 core based on the Kepler architecture. Compared to the GeForce GTX 680M, the GTX 680MX features 1536 instead of 1344 CUDA cores and higher memory clocks (720/2500MHz vs 720/1800 MHz).
Architecture
The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 400M series. The GK104 Kepler core offers eight shader blocks, called SMX, that are clocked at the same speed as the central core. In the GTX 680MX, all 8 blocks are active leading to the 1536 CUDA cores. 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 of similar speed to one shader of a Fermi chip (as 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
Thanks to the additional shader cores and the faster memory, the graphics performance of the GeForce GTX 680MX should be 15 - 25 percent above the GTX 680M and similar to the Desktop GTX 580. The GPU has enough power to run demanding games of 2012 fluently with Full HD resolution and maxed out graphical settings. Battlefield 3, Skyrim, and Crysis 2, for example, are playable at the highest detail settings.
E.g. in Battlefield 3 the GTX 680MX could deliver 30 fps in our benchmark sequence at native 2560x1440 and ultra settings. For fluent multiplayer gameplay therefore the resolution or anti aliasing should be reduced (e.g. 1920x1080 Ultra at 45 fps).
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 GK104 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 GTX 680MX should be somewhat higher than the GTX 680M, making it hard to cool in a small laptop case. Probably, only Apples iMac computer will use the GTX 680MX.
| Manufacturer | NVIDIA |
| GeForce GTX 600M Series | GeForce GTX 680M SLI 2688@720MHz GeForce GTX 680MX 1536@720MHz GeForce GTX 675M SLI 768@620MHz GeForce GTX 670MX SLI 1920@600MHz GeForce GTX 680M 1344@720MHz GeForce GTX 675MX 960@600MHz GeForce GTX 675M 384@620MHz GeForce GTX 670MX 960@600MHz GeForce GTX 670M 336@598MHz GeForce GTX 660M 384@835MHz |
| Architecture | Kepler |
| Pipelines | 1536 - unified |
| Core Speed * | 720 MHz |
| Shader Speed * | 720 MHz |
| Memory Speed * | 2500 MHz |
| Memory Bus Width | 256 Bit |
| Memory Type | GDDR5 |
| Max. Amount of Memory | 2048 MB |
| Shared Memory | no |
| DirectX | DirectX 11, Shader 5.0 |
| Current Consumption | 122 Watt |
| Transistors | 3540 Million |
| technology | 28 nm |
| Features | Optimus, SLI, PhysX, Verde Drivers, CUDA, 3D Vision, 3DTV Play |
| Notebook Size | large |
| Date of Announcement | 23.10.2012 |
| Link to Manufacturer Page | http://www.geforce.com/hardware/notebook... |
Benchmarks
1 benchmarks and specifications
1 benchmarks and specifications
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics cardGame 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.
For more games that might be playable and a list of all games and graphics cards visit our Gaming List
No reviews found for this graphics card.
