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GeForce 830M vs GeForce 840M

Intro

The GeForce 830M comes with a GPU core speed of 1029 MHz, and the 2048 MB of DDR3 memory runs at 900 MHz through a 64-bit bus. It also features 256 SPUs, 16 Texture Address Units, and 8 ROPs.

Compare all that to the GeForce 840M, which has core speeds of 1029 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs as well as 24 TAUs and 8 Rasterization Operator Units.

Display Graphs

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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

As far as performance goes, the GeForce 840M should theoretically be a small bit superior to the GeForce 830M overall. (explain)

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

Texel Rate

The GeForce 840M will be much (about 50%) better at texture filtering 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 in theory they should be equally good at at AA, 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: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines 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 rate also depends on lots of other factors, most notably the memory bandwidth of the card - 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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