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GeForce 820M vs GeForce 825M

Intro

The GeForce 820M comes with a GPU core speed of 719 MHz, and the 2048 MB of DDR3 memory runs at 1000 MHz through a 64-bit bus. It also is made up of 96 Stream Processors, 16 TAUs, and 4 Raster Operation Units.

Compare all that to the GeForce 825M, which has GPU core speed of 850 MHz, and 2048 MB of DDR3 memory set to run at 900 MHz through a 64-bit bus. It also is made up of 384 Stream Processors, 16 TAUs, and 8 Raster Operation Units.

Display Graphs

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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

Theoretically speaking, the GeForce 820M will be 11% quicker than the GeForce 825M in general, due to its higher data rate. (explain)

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

Texel Rate

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

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

Pixel Rate

The GeForce 825M is a lot (approximately 136%) more effective at anti-aliasing than the GeForce 820M, and also capable of handling higher screen resolutions while still performing well. (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 maximum amount of data (measured in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it must 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 AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to 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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