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GeForce 825M vs GeForce 830M

Intro

The GeForce 825M uses a 28 nm design. nVidia has clocked the core frequency at 850 MHz. The DDR3 RAM is set to run at a frequency of 900 MHz on this particular model. It features 384 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare those specs to the GeForce 830M, which features clock speeds of 1029 MHz on the GPU, and 900 MHz on the 2048 MB of DDR3 RAM. It features 256 SPUs as well as 16 Texture Address Units and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M 25 Watts
GeForce 825M 33 Watts
Difference: 8 Watts (32%)

Memory Bandwidth

Both cards have the exact same memory bandwidth, so theoretically they should perform the same. (explain)

Texel Rate

The GeForce 830M is quite a bit (more or less 21%) more effective at texture filtering than the GeForce 825M. (explain)

GeForce 830M 16464 Mtexels/sec
GeForce 825M 13600 Mtexels/sec
Difference: 2864 (21%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 830M is superior to the GeForce 825M, by a large margin. (explain)

GeForce 830M 8232 Mpixels/sec
GeForce 825M 6800 Mpixels/sec
Difference: 1432 (21%)

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 825M

Amazon.com

Check prices at:

GeForce 830M

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 825M GeForce 830M
Manufacturer nVidia nVidia
Year January 27 2014 March 12 2014
Code Name GK208 GM108
Memory 2048 MB 2048 MB
Core Speed 850 MHz 1029 MHz
Memory Speed 1800 MHz 1800 MHz
Power (Max TDP) 33 watts 25 watts
Bandwidth 14400 MB/sec 14400 MB/sec
Texel Rate 13600 Mtexels/sec 16464 Mtexels/sec
Pixel Rate 6800 Mpixels/sec 8232 Mpixels/sec
Unified Shaders 384 256
Texture Mapping Units 16 16
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 x8 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 825M

Amazon.com

Check prices at:

GeForce 830M

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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