GeForce 810M vs GeForce 825M

Intro

Compare all of that to the GeForce 825M, which uses a 28 nm design. nVidia has clocked the core frequency at 850 MHz. The DDR3 RAM works at a frequency of 900 MHz on this particular card. It features 384 SPUs as well as 16 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 810M		15 Watts
GeForce 825M		33 Watts
	Difference: 18 Watts (120%)

Memory Bandwidth

Both cards have exactly the same bandwidth, so theoretically they should perform exactly the same. (explain)

Texel Rate

The GeForce 825M is much (about 130%) faster with regards to texture filtering than the GeForce 810M. (explain)

GeForce 825M		13600 Mtexels/sec
GeForce 810M		5904 Mtexels/sec
	Difference: 7696 (130%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 825M is the winner, and very much so. (explain)

GeForce 825M		6800 Mpixels/sec
GeForce 810M		2952 Mpixels/sec
	Difference: 3848 (130%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core 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 processed per second.

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