GeForce GTX 285 2GB vs GeForce GTX 660

Intro

Compare that to the GeForce GTX 660, which comes with a clock frequency of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also features a 192-bit memory bus, and makes use of a 28 nm design. It is comprised of 960 SPUs, 80 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 64 Watts (46%)

Memory Bandwidth

In theory, the GeForce GTX 285 2GB should perform just a bit faster than the GeForce GTX 660 overall. (explain)

GeForce GTX 285 2GB		158976 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 14784 (10%)

Texel Rate

The GeForce GTX 660 is a lot (more or less 51%) faster with regards to anisotropic filtering than the GeForce GTX 285 2GB. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 26560 (51%)

Pixel Rate

The GeForce GTX 660 will be a bit (more or less 13%) faster with regards to full screen anti-aliasing than the GeForce GTX 285 2GB, and also should be capable of handling higher resolutions better. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 2784 (13%)

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 data (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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 - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.