GeForce 825M vs GeForce GTX 880M

Intro

Compare all that to the GeForce GTX 880M, which comes with a clock frequency of 954 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It is comprised of 1536 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce GTX 880M		130 Watts
	Difference: 97 Watts (294%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 880M should theoretically be a lot better than the GeForce 825M overall. (explain)

GeForce GTX 880M		128000 MB/sec
GeForce 825M		14400 MB/sec
	Difference: 113600 (789%)

Texel Rate

The GeForce GTX 880M should be a lot (more or less 798%) better at anisotropic filtering than the GeForce 825M. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce 825M		13600 Mtexels/sec
	Difference: 108512 (798%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 880M is superior to the GeForce 825M, and very much so. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce 825M		6800 Mpixels/sec
	Difference: 23728 (349%)

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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. The number 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 DDR5, multiply by 4 instead. 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 texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.