GeForce GTX 285 2GB vs Geforce GTX 680

Intro

Compare those specifications to the Geforce GTX 680, which uses a 28 nm design. nVidia has clocked the core frequency at 1006 MHz. The GDDR5 memory works at a frequency of 1502 MHz on this specific model. It features 1536 SPUs along with 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680		195 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 9 Watts (5%)

Memory Bandwidth

Performance-wise, the Geforce GTX 680 should in theory be a lot better than the GeForce GTX 285 2GB in general. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 33280 (21%)

Texel Rate

The Geforce GTX 680 will be a lot (about 148%) better at texture filtering than the GeForce GTX 285 2GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 76928 (148%)

Pixel Rate

If using a high resolution is important to you, then the Geforce GTX 680 is the winner, by far. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 11456 (55%)

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 (in units of MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.