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GeForce 825M vs GeForce GTX 1080

Intro

The GeForce 825M has a core clock speed of 850 MHz and a DDR3 memory speed of 900 MHz. It also uses a 64-bit bus, and uses a 28 nm design. It is made up of 384 SPUs, 16 TAUs, and 8 Raster Operation Units.

Compare those specifications to the GeForce GTX 1080, which has core speeds of 1607 MHz on the GPU, and 1251 MHz on the 8192 MB of GDDR5X memory. It features 2560 SPUs along with 160 Texture Address Units and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M 33 Watts
GeForce GTX 1080 180 Watts
Difference: 147 Watts (445%)

Memory Bandwidth

Theoretically, the GeForce GTX 1080 should be a lot faster than the GeForce 825M overall. (explain)

GeForce GTX 1080 327680 MB/sec
GeForce 825M 14400 MB/sec
Difference: 313280 (2176%)

Texel Rate

The GeForce GTX 1080 is a lot (more or less 1791%) better at texture filtering than the GeForce 825M. (explain)

GeForce GTX 1080 257120 Mtexels/sec
GeForce 825M 13600 Mtexels/sec
Difference: 243520 (1791%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 1080 is a better choice, and very much so. (explain)

GeForce GTX 1080 102848 Mpixels/sec
GeForce 825M 6800 Mpixels/sec
Difference: 96048 (1412%)

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

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GeForce GTX 1080

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 825M GeForce GTX 1080
Manufacturer nVidia nVidia
Year January 27 2014 May 2016
Code Name GK208 GP104-400
Memory 2048 MB 8192 MB
Core Speed 850 MHz 1607 MHz
Memory Speed 1800 MHz 10008 MHz
Power (Max TDP) 33 watts 180 watts
Bandwidth 14400 MB/sec 327680 MB/sec
Texel Rate 13600 Mtexels/sec 257120 Mtexels/sec
Pixel Rate 6800 Mpixels/sec 102848 Mpixels/sec
Unified Shaders 384 2560
Texture Mapping Units 16 160
Render Output Units 8 64
Bus Type DDR3 GDDR5X
Bus Width 64-bit 256-bit
Fab Process 28 nm 16 nm
Transistors (Unknown) million 7200 million
Bus PCIe 3.0 x8 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12.0
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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GeForce 825M

Amazon.com

Check prices at:

GeForce GTX 1080

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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