GeForce GTX 285 2GB vs GeForce GTX 880M

Intro

Compare those specs to the GeForce GTX 880M, which features GPU clock speed of 954 MHz, and 4096 MB of GDDR5 memory running at 1000 MHz through a 256-bit bus. It also features 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 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 greater data rate. (explain)

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

Texel Rate

The GeForce GTX 880M is much (more or less 136%) faster with regards to texture 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 much (approximately 47%) better at FSAA than the GeForce GTX 285 2GB, and also should be capable of handling higher 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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.