GeForce GTX 285 1GB vs GeForce GTX 880M

Intro

Compare those specifications to the GeForce GTX 880M, which uses a 28 nm design. nVidia has clocked the core speed at 954 MHz. The GDDR5 memory works at a frequency of 1000 MHz on this specific model. It features 1536 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 880M		130 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 74 Watts (57%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 1GB will be 24% quicker than the GeForce GTX 880M overall, because of its greater data rate. (explain)

GeForce GTX 285 1GB		158976 MB/sec
GeForce GTX 880M		128000 MB/sec
	Difference: 30976 (24%)

Texel Rate

The GeForce GTX 880M should be much (more or less 136%) better at anisotropic filtering than the GeForce GTX 285 1GB. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 70272 (136%)

Pixel Rate

The GeForce GTX 880M should be quite a bit (about 47%) better at full screen anti-aliasing than the GeForce GTX 285 1GB, and should be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 9792 (47%)

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 data (in units of megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, 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 is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher 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 most pixels the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.