GeForce GTX 285 2GB vs Geforce GTX 680

Intro

Compare those specifications to the Geforce GTX 680, which makes use of a 28 nm design. nVidia has set the core speed at 1006 MHz. The GDDR5 RAM runs at a speed of 1502 MHz on this particular card. It features 1536 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

Hide Graphs

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

Theoretically speaking, 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 should 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

The Geforce GTX 680 is much (about 55%) better at anti-aliasing than the GeForce GTX 285 2GB, and will be able to handle higher resolutions more effectively. (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 max amount of information (in units of MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of 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.