The NVIDIA GeForce GTX 680MX is a high-end DirectX 11-compatible graphics card commonly found on Apple iMac products. It is based on the 28nm GK104 Kepler architecture similar to the GTX 680M, but features more CUDA cores (1536 vs. 1344) and a higher memory clock rate (720/2500MHz vs. 720/1800MHz)


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 eight blocks are active for a total of 1536 CUDA cores. Although the Kepler architecture can utilize more shader cores than a Fermi chip, its shaders can 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.


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.

As an example, the GTX 680MX can play Battlefield 3 on ultra settings at 30 FPS on a native resolution of 2560x1440 during our benchmark sequence. For fluent multiplayer gameplay, the resolution and/or anti-aliasing should be reduced (e.g. 1920x1080 Ultra at 45 fps).


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 difficult to cool for laptops. The Apple iMac is currently the most readily available product to utilize this high-end card.

GeForce GTX 600M Series
GeForce GTX 680M SLI 2688 @ 720 MHz2x 256 Bit @ 3600 MHz
GeForce GTX 680MX 1536 @ 720 MHz256 Bit @ 5000 MHz
GeForce GTX 675M SLI 768 @ 620 MHz256 Bit @ 3000 MHz
GeForce GTX 680M 1344 @ 720 MHz256 Bit @ 3600 MHz
GeForce GTX 670MX SLI 1920 @ 600 MHz2x 192 Bit @ 2800 MHz
GeForce GTX 675MX 960 @ 600 MHz256 Bit @ 3600 MHz
GeForce GTX 675M 384 @ 620 MHz256 Bit @ 3000 MHz
GeForce GTX 670MX 960 @ 600 MHz192 Bit @ 2800 MHz
GeForce GTX 670M 336 @ 598 MHz192 Bit @ 3000 MHz
GeForce GTX 660M 384 @ 835 MHz128 Bit @ 4000 MHz
Pipelines1536 - unified
Core Speed *720 MHz
Memory Speed *5000 MHz
Memory Bus Width256 Bit
Memory TypeGDDR5
Max. Amount of Memory2048 MB
Shared Memoryno
DirectXDirectX 11, Shader 5.0
Power Consumption122 Watt
Transistors3540 Million
technology28 nm
FeaturesOptimus, SLI, PhysX, Verde Drivers, CUDA, 3D Vision, 3DTV Play
Notebook Sizelarge
Date of Announcement23.10.2012
Link to Manufacturer Page
* The specified clock rates are only guidelines for the manufacturer and can be altered by them.


3DMark 11 - Performance 1280x720
min: 6883      avg: 6883 (38%)     median: 6883 (38%)     max: 6883 points
3DMark Vantage - P GPU no PhysX 1280x1024
min: 25270      avg: 25270 (49%)     median: 25270 (49%)     max: 25270 Points
3DMark Vantage - P Result no PhysX 1280x1024
min: 25501      avg: 25501 (53%)     median: 25501 (53%)     max: 25501 Points
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card

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.

Dead Space 3
ultra 1920x1080
133  fps      Compare
» With all tested laptops playable in detail settings ultra.
Hitman: Absolution
high 1366x768
55.4  fps      Compare
ultra 1920x1080
34.4  fps      Compare
» With all tested laptops playable in detail settings high.
F1 2012

F1 2012

ultra 1920x1080
97.5  fps      Compare
» With all tested laptops playable in detail settings ultra.
Sleeping Dogs
high 1366x768
99  fps      Compare
ultra 1920x1080
31.1  fps      Compare
» With all tested laptops playable in detail settings high.
Battlefield 3
low 1024x768
126  fps      Compare
med. 1366x768
104  fps      Compare
high 1366x768
92  fps      Compare
ultra 1920x1080
45.6  fps      Compare
» With all tested laptops playable in detail settings ultra.

For more games that might be playable and a list of all games and graphics cards visit our Gaming List

#0 Did not recreate cache, as it is less than 5 days old +0.001s ... 0.001s

#1 min, max, avg, median took 3.1948089599609E-5s +0.094s ... 0.095s

#2 Before gaming benchmark output +0s ... 0.095s

#3 return log +0.125s ... 0.22s

No reviews found for this graphics card.

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Class 1
GeForce GTX 590
GeForce GTX 580
Radeon HD 6970
GeForce GTX 570
GeForce GTX 560 Ti
Radeon HD 5850
Radeon HD 7770
Radeon HD 7770
GeForce GTX 460 768MB
Radeon HD 6790
Radeon HD 5770
GeForce GTX 550 Ti
Class 2
GeForce GTS 450
Radeon HD 4850
Class 3
Radeon HD 5670
GeForce GT 240
Radeon R6 M255DX
GeForce GT 430
Radeon HD 5570
GeForce GT 220
Mali-T760 MP8
Adreno 430
Radeon HD 6450 GDDR5
Class 4
Mali-T760 MP6
HD Graphics (Cherry Trail) *
Class 5
Radeon HD 4350
GeForce G 107M *
PowerVR GX6250
Chrome9HD *
Mali-T628 MP4
Adreno 405 *
Class 6
Mali-T760 MP2
unknown *

* Approximate position of the graphics adapter

> Notebook / Laptop Reviews and News > Benchmarks / Tech > Comparison of Laptop Graphics Cards > NVIDIA GeForce GTX 680MX
Author: Klaus Hinum (Update: 2014-01-15)