GeForce GTX 285 2GB vs GeForce GTX 880M

Intro

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

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 880M		130 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 74 Watts (57%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 285 2GB is 24% faster than the GeForce GTX 880M overall, because of its higher bandwidth. (explain)

GeForce GTX 285 2GB		158976 MB/sec
GeForce GTX 880M		128000 MB/sec
	Difference: 30976 (24%)

Texel Rate

The GeForce GTX 880M will be much (more or less 136%) better at anisotropic filtering than the GeForce GTX 285 2GB. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 70272 (136%)

Pixel Rate

The GeForce GTX 880M will be a lot (approximately 47%) better at full screen anti-aliasing than the GeForce GTX 285 2GB, and will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce GTX 285 2GB		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 maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR 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 number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. 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 memory bandwidth is, the lower the potential to reach the max fill rate.