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GeForce 830M vs GeForce 840M

Intro

The GeForce 830M features clock speeds of 1029 MHz on the GPU, and 900 MHz on the 2048 MB of DDR3 RAM. It features 256 SPUs along with 16 Texture Address Units and 8 Rasterization Operator Units.

Compare those specifications to the GeForce 840M, which has a GPU core clock speed of 1029 MHz, and 2048 MB of DDR3 memory set to run at 1000 MHz through a 64-bit bus. It also is made up of 384 Stream Processors, 24 TAUs, and 8 Raster Operation 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

Theoretically, the GeForce 840M should perform just a 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 a lot (more or less 50%) better at 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 in theory they should be 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 max amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max 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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