GeForce GTX 280 vs GeForce GTX 285 1GB

Intro

Compare that to the GeForce GTX 285 1GB, which comes with a clock frequency of 648 MHz and a GDDR3 memory speed of 1242 MHz. It also features a 512-bit bus, and makes use of a 55 nm design. It is made up of 240 SPUs, 80 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 285 1GB		204 Watts
GeForce GTX 280		236 Watts
	Difference: 32 Watts (16%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 285 1GB should theoretically be a small bit superior to the GeForce GTX 280 overall. (explain)

GeForce GTX 285 1GB		158976 MB/sec
GeForce GTX 280		141696 MB/sec
	Difference: 17280 (12%)

Texel Rate

The GeForce GTX 285 1GB is a little bit (more or less 8%) better at anisotropic filtering than the GeForce GTX 280. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
GeForce GTX 280		48160 Mtexels/sec
	Difference: 3680 (8%)

Pixel Rate

The GeForce GTX 285 1GB is a little bit (more or less 8%) faster with regards to full screen anti-aliasing than the GeForce GTX 280, and should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
GeForce GTX 280		19264 Mpixels/sec
	Difference: 1472 (8%)

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 largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one 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 - also 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 of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.