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GeForce 820M vs GeForce 825M

Intro

The GeForce 820M makes use of a 28 nm design. nVidia has set the core speed at 719 MHz. The DDR3 RAM runs at a speed of 1000 MHz on this card. It features 96 SPUs along with 16 Texture Address Units and 4 Rasterization Operator Units.

Compare all that to the GeForce 825M, which comes with clock speeds of 850 MHz on the GPU, and 900 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 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

The GeForce 820M should in theory be a small 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 will be a small bit (approximately 18%) more effective at AF than the GeForce 820M. (explain)

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

Pixel Rate

The GeForce 825M will be quite a bit (about 136%) faster with regards to FSAA than the GeForce 820M, and also will be capable of handling higher resolutions more effectively. (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: Bandwidth is the max amount of data (counted in MB per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

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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