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GeForce 820M vs GeForce 825M

Intro

The GeForce 820M has a GPU clock speed of 719 MHz, and the 2048 MB of DDR3 memory is set to run at 1000 MHz through a 64-bit bus. It also features 96 SPUs, 16 TAUs, and 4 ROPs.

Compare those specifications to the GeForce 825M, which uses a 28 nm design. nVidia has set the core speed at 850 MHz. The DDR3 RAM is set to run at a speed of 900 MHz on this card. It features 384 SPUs as well as 16 TAUs and 8 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 820M 15 Watts
GeForce 825M 33 Watts
Difference: 18 Watts (120%)

Memory Bandwidth

In theory, the GeForce 820M should perform a little bit faster than the GeForce 825M overall. (explain)

GeForce 820M 16000 MB/sec
GeForce 825M 14400 MB/sec
Difference: 1600 (11%)

Texel Rate

The GeForce 825M should be a little bit (more or less 18%) faster with regards to AF than the GeForce 820M. (explain)

GeForce 825M 13600 Mtexels/sec
GeForce 820M 11504 Mtexels/sec
Difference: 2096 (18%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 825M is a better choice, by a large margin. (explain)

GeForce 825M 6800 Mpixels/sec
GeForce 820M 2876 Mpixels/sec
Difference: 3924 (136%)

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 820M

Amazon.com

Check prices at:

GeForce 825M

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 820M GeForce 825M
Manufacturer nVidia nVidia
Year February 2014 January 27 2014
Code Name GF117 GK208
Memory 2048 MB 2048 MB
Core Speed 719 MHz 850 MHz
Memory Speed 2000 MHz 1800 MHz
Power (Max TDP) 15 watts 33 watts
Bandwidth 16000 MB/sec 14400 MB/sec
Texel Rate 11504 Mtexels/sec 13600 Mtexels/sec
Pixel Rate 2876 Mpixels/sec 6800 Mpixels/sec
Unified Shaders 96 384
Texture Mapping Units 16 16
Render Output Units 4 8
Bus Type DDR3 DDR3
Bus Width 64-bit 64-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 2.0 x16 PCIe 3.0 x8
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 MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once 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 number of texture map elements (texels) that are applied per second. This figure 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce 820M

Amazon.com

Check prices at:

GeForce 825M

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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