GeForce 825M vs GeForce GTX 880M

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the GeForce GTX 880M should perform much faster 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 will be much (more or less 798%) more effective 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 using lots of anti-aliasing is important to you, then the GeForce GTX 880M is a better choice, by a large margin. (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 (measured in megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR RAM, the result should be multiplied by 2 once again. If 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the video 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 amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.