NVIDIA GeForce GTX 675MX vs NVIDIA GeForce GTX 670MX

NVIDIA GeForce GTX 675MX

The NVIDIA GeForce GTX 675MX is a high-end DirectX 11.1-compatible graphics card for laptops and was announced in October 2012. As opposed to the Fermi-based GTX 675M, the 675MX uses a newer 28nm GK104 core based on the Kepler architecture, similar to the GeForce 680M.

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 675MX, five blocks are active for a total of 1344 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.

Performance

The graphics performance of the GeForce GTX 675MX is significantly higher than the old Fermi based GTX 675M and therefore similar fast as the Geforce GTX 560M SLI combination. Even demanding games of 2012 run fluently in highest detail settings, except for titles like Sleeping Dogs or Guild Wars 2.

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 675M should be slightly below the GTX 680M but still only suited for large notebooks (17-inches or greater) and desktop replacements.

NVIDIA GeForce GTX 670MX

► remove from comparison

The NVIDIA GeForce GTX 670MX is a high-end DirectX 11-compatible graphics card for laptops. As opposed to the Fermi-based GTX 670M, the 670MX uses a newer 28nm GK106 core based on the Kepler architecture, similar in structure to the GTX 675MX and 680M. Compared to the slightly faster GTX 675MX, the 670MX offers a narrower memory bandwidth of 67.2 GB/s (vs. 115.2 GB/s of the 675MX) due to both slower memory modules and a smaller 192-bit bus width.

Architecture

The Kepler architecture is the successor to the Fermi architecture that first appeared in laptops with the GeForce 400M series. The GK106 Kepler core offers five shader blocks, called SMX, that are clocked at the same speed as the central core. In the GTX 670MX, all five blocks are active for a total of 960 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).

Performance

The graphics performance of the GeForce GTX 670MX is clearly above the older GTX 670M and therefore in the high-end class of mobile graphics cards of 2012. Only the extremely demanding title The Witcher 2 may not run fluently in ultra settings. Battlefield 3, Skyrim, and Crysis 2, for example, are playable at the highest detail settings.

Features

The power consumption of the GeForce GTX 670MX should be similar to the GTX 670M and is therefore best suited for large notebooks (17-inches or greater) and desktop replacements.

show full text

NVIDIA GeForce GTX 675MX

NVIDIA GeForce GTX 670MX

GeForce GTX 600M Series

GeForce GTX 680M SLI	2688 @ 0.72 GHz	2x 256 Bit @ 3600 MHz
GeForce GTX 680MX	1536 @ 0.72 GHz	256 Bit @ 5000 MHz
GeForce GTX 675M SLI	768 @ 0.62 GHz	256 Bit @ 3000 MHz
GeForce GTX 680M	1344 @ 0.72 GHz	256 Bit @ 3600 MHz
GeForce GTX 670MX SLI	1920 @ 0.6 GHz	2x 192 Bit @ 2800 MHz
GeForce GTX 675MX	960 @ 0.6 GHz	256 Bit @ 3600 MHz
GeForce GTX 675M	384 @ 0.62 GHz	256 Bit @ 3000 MHz
GeForce GTX 670MX	960 @ 0.6 GHz	192 Bit @ 2800 MHz
GeForce GTX 670M	336 @ 0.6 GHz	192 Bit @ 3000 MHz
GeForce GTX 660M	384 @ 0.84 GHz	128 Bit @ 4000 MHz

GeForce GTX 680M SLI	2688 @ 0.72 GHz	2x 256 Bit @ 3600 MHz
GeForce GTX 680MX	1536 @ 0.72 GHz	256 Bit @ 5000 MHz
GeForce GTX 675M SLI	768 @ 0.62 GHz	256 Bit @ 3000 MHz
GeForce GTX 680M	1344 @ 0.72 GHz	256 Bit @ 3600 MHz
GeForce GTX 670MX SLI	1920 @ 0.6 GHz	2x 192 Bit @ 2800 MHz
GeForce GTX 675MX	960 @ 0.6 GHz	256 Bit @ 3600 MHz
GeForce GTX 675M	384 @ 0.62 GHz	256 Bit @ 3000 MHz
GeForce GTX 670MX	960 @ 0.6 GHz	192 Bit @ 2800 MHz
GeForce GTX 670M	336 @ 0.6 GHz	192 Bit @ 3000 MHz
GeForce GTX 660M	384 @ 0.84 GHz	128 Bit @ 4000 MHz

Codename

N13E-GSR

N13E-GR

Architecture

Kepler

Pipelines

960 - unified

Core Speed

600 MHz

Memory Speed

3600 MHz

2800 MHz

Memory Bus Width

256 Bit

192 Bit

Memory Type

GDDR5

Shared Memory

API

DirectX 11, Shader 5.0, OpenGL 4.1

DirectX 11, Shader 5.1, OpenGL 4.2

Power Consumption

100 Watt

75 Watt

Transistors

3.5 Billion

2.5 Billion

technology

28 nm

Features

Optimus, PhysX, Verde Drivers, CUDA, 3D Vision, 3DTV Play

Optimus, SLI, PhysX, Verde Drivers, CUDA, 3D Vision, 3DTV Play

Notebook Size

large

Date of Announcement

01.10.2012

Link to Manufacturer Page

www.geforce.com