GeForce GTX 285 1GB vs GeForce GTX 660

Intro

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

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

The GeForce GTX 285 1GB, in theory, should be just a bit faster than 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 should be much (about 51%) better at texture filtering 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

If running with lots of anti-aliasing is important to you, then the GeForce GTX 660 is a better choice, but only just. (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: Memory bandwidth is the max amount of information (counted in MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 potential to get to the maximum fill rate.