GeForce GTX 285 1GB vs Geforce GTX 680

Intro

Compare those specifications to the Geforce GTX 680, which features GPU clock speed of 1006 MHz, and 2048 MB of GDDR5 RAM set to run at 1502 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680		195 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 9 Watts (5%)

Memory Bandwidth

In theory, the Geforce GTX 680 should perform quite a bit faster than the GeForce GTX 285 1GB in general. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GTX 285 1GB		158976 MB/sec
	Difference: 33280 (21%)

Texel Rate

The Geforce GTX 680 is a lot (approximately 148%) better at anisotropic filtering than the GeForce GTX 285 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 76928 (148%)

Pixel Rate

The Geforce GTX 680 will be a lot (about 55%) more effective at FSAA than the GeForce GTX 285 1GB, and capable of handling higher resolutions more effectively. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 11456 (55%)

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 (measured in megabytes per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.