GeForce GTX 285 2GB vs GeForce GTX 660

Intro

Compare all of that to the GeForce GTX 660, which features a GPU core clock speed of 980 MHz, and 2048 MB of GDDR5 memory set to run at 1502 MHz through a 192-bit bus. It also is made up 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

Performance-wise, the GeForce GTX 285 2GB should theoretically be a little bit superior to the GeForce GTX 660 in general. (explain)

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

Texel Rate

The GeForce GTX 660 should be much (more or less 51%) faster with regards to texture 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 is a small bit (approximately 13%) faster with regards to anti-aliasing than the GeForce GTX 285 2GB, and also will be capable of handling higher screen 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 MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card 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 clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many 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.