GeForce GTX 285 2GB vs Geforce GTX 680

Intro

Compare those specs to the Geforce GTX 680, which uses a 28 nm design. nVidia has clocked the core speed at 1006 MHz. The GDDR5 memory runs at a speed of 1502 MHz on this specific model. It features 1536 SPUs along with 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 680		195 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 9 Watts (5%)

Memory Bandwidth

In theory, the Geforce GTX 680 should perform quite a bit faster than the GeForce GTX 285 2GB overall. (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 (more or less 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

The Geforce GTX 680 is quite a bit (more or less 55%) faster with regards to FSAA than the GeForce GTX 285 2GB, and also should be able to handle higher resolutions better. (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 maximum amount of information (in units of MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher 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 amount of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video 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 maximum amount of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.