GeForce GTX 285 1GB vs GeForce GTX 660

Intro

Compare those specifications to the GeForce GTX 660, which features a clock frequency of 980 MHz and a GDDR5 memory frequency of 1502 MHz. It also makes use of a 192-bit bus, and makes use of a 28 nm design. It features 960 SPUs, 80 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660		140 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 64 Watts (46%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 1GB should theoretically be a bit superior to the GeForce GTX 660 in general. (explain)

GeForce GTX 285 1GB		158976 MB/sec
GeForce GTX 660		144192 MB/sec
	Difference: 14784 (10%)

Texel Rate

The GeForce GTX 660 is much (about 51%) more effective at AF than the GeForce GTX 285 1GB. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 26560 (51%)

Pixel Rate

The GeForce GTX 660 is just a bit (more or less 13%) better at full screen anti-aliasing than the GeForce GTX 285 1GB, and also able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce GTX 285 1GB		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 information (measured in megabytes per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.