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GeForce 830M vs GeForce 840M

Intro

The GeForce 830M features a clock speed of 1029 MHz and a DDR3 memory frequency of 900 MHz. It also features a 64-bit bus, and uses a 28 nm design. It features 256 SPUs, 16 TAUs, and 8 ROPs.

Compare those specs to the GeForce 840M, which uses a 28 nm design. nVidia has clocked the core speed at 1029 MHz. The DDR3 RAM works at a speed of 1000 MHz on this model. It features 384 SPUs as well as 24 TAUs and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M 25 Watts
GeForce 840M 30 Watts
Difference: 5 Watts (20%)

Memory Bandwidth

The GeForce 840M should in theory perform a little bit faster than the GeForce 830M overall. (explain)

GeForce 840M 16000 MB/sec
GeForce 830M 14400 MB/sec
Difference: 1600 (11%)

Texel Rate

The GeForce 840M should be much (approximately 50%) faster with regards to AF than the GeForce 830M. (explain)

GeForce 840M 24696 Mtexels/sec
GeForce 830M 16464 Mtexels/sec
Difference: 8232 (50%)

Pixel Rate

Both cards have exactly the same pixel fill rate, so theoretically they should perform equally good at at FSAA, and be able to handle the same screen resolutions. (explain)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce 830M

Amazon.com

Check prices at:

GeForce 840M

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 830M GeForce 840M
Manufacturer nVidia nVidia
Year March 12 2014 March 12 2014
Code Name GM108 GM108
Memory 2048 MB 2048 MB
Core Speed 1029 MHz 1029 MHz
Memory Speed 1800 MHz 2000 MHz
Power (Max TDP) 25 watts 30 watts
Bandwidth 14400 MB/sec 16000 MB/sec
Texel Rate 16464 Mtexels/sec 24696 Mtexels/sec
Pixel Rate 8232 Mpixels/sec 8232 Mpixels/sec
Unified Shaders 256 384
Texture Mapping Units 16 24
Render Output Units 8 8
Bus Type DDR3 DDR3
Bus Width 64-bit 64-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 830M

Amazon.com

Check prices at:

GeForce 840M

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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