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GeForce 820M vs GeForce 825M

Intro

The GeForce 820M features a clock speed of 719 MHz and a DDR3 memory speed of 1000 MHz. It also makes use of a 64-bit memory bus, and uses a 28 nm design. It is comprised of 96 SPUs, 16 Texture Address Units, and 4 Raster Operation Units.

Compare all of that to the GeForce 825M, which makes use of a 28 nm design. nVidia has set the core speed at 850 MHz. The DDR3 memory works at a speed of 900 MHz on this specific model. It features 384 SPUs as well as 16 Texture Address Units and 8 ROPs.

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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

The GeForce 820M should theoretically perform a little bit faster than the GeForce 825M in general. (explain)

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

Texel Rate

The GeForce 825M is a bit (more or less 18%) better at texture filtering than the GeForce 820M. (explain)

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

Pixel Rate

If using a high resolution 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

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GeForce 825M

Amazon.com

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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 data (measured in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed 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 higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied 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 worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability 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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