GeForce GTX 285 1GB vs Geforce GTX 680

Intro

Compare that to the Geforce GTX 680, which makes use of a 28 nm design. nVidia has clocked the core speed at 1006 MHz. The GDDR5 memory works at a speed of 1502 MHz on this particular model. It features 1536 SPUs as well as 128 TAUs 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 1GB		204 Watts
	Difference: 9 Watts (5%)

Memory Bandwidth

In theory, the Geforce GTX 680 should be a lot faster than the GeForce GTX 285 1GB overall. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 285 1GB		158976 MB/sec
	Difference: 33280 (21%)

Texel Rate

The Geforce GTX 680 is a lot (approximately 148%) faster with regards to texture filtering than the GeForce GTX 285 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 76928 (148%)

Pixel Rate

The Geforce GTX 680 will be quite a bit (more or less 55%) better at AA than the GeForce GTX 285 1GB, and also able to handle higher resolutions while still performing well. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 285 1GB		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 data (counted in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 processed 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. 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 many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.