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GeForce 825M vs GeForce GTX 850M

Intro

The GeForce 825M has core clock speeds of 850 MHz on the GPU, and 900 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs along with 16 TAUs and 8 Rasterization Operator Units.

Compare those specifications to the GeForce GTX 850M, which comes with a core clock speed of 876 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It features 640 SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M 33 Watts
GeForce GTX 850M 40 Watts
Difference: 7 Watts (21%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 850M should theoretically be much superior to the GeForce 825M in general. (explain)

GeForce GTX 850M 32000 MB/sec
GeForce 825M 14400 MB/sec
Difference: 17600 (122%)

Texel Rate

The GeForce GTX 850M will be quite a bit (more or less 158%) faster with regards to anisotropic filtering than the GeForce 825M. (explain)

GeForce GTX 850M 35040 Mtexels/sec
GeForce 825M 13600 Mtexels/sec
Difference: 21440 (158%)

Pixel Rate

The GeForce GTX 850M should be much (more or less 106%) faster with regards to AA than the GeForce 825M, and also should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 850M 14016 Mpixels/sec
GeForce 825M 6800 Mpixels/sec
Difference: 7216 (106%)

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 850M

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 850M
Manufacturer nVidia nVidia
Year January 27 2014 March 12 2014
Code Name GK208 GM107
Memory 2048 MB 2048 MB
Core Speed 850 MHz 876 MHz
Memory Speed 1800 MHz 2000 MHz
Power (Max TDP) 33 watts 40 watts
Bandwidth 14400 MB/sec 32000 MB/sec
Texel Rate 13600 Mtexels/sec 35040 Mtexels/sec
Pixel Rate 6800 Mpixels/sec 14016 Mpixels/sec
Unified Shaders 384 640
Texture Mapping Units 16 40
Render Output Units 8 16
Bus Type DDR3 DDR3
Bus Width 64-bit 128-bit
Fab Process 28 nm 28 nm
Transistors (Unknown) million (Unknown) million
Bus PCIe 3.0 x8 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.5 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 can be processed in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour 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 fill rate also depends on quite a few other factors, most notably 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 850M

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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