GeForce GTX 285 1GB vs Geforce GTX 680

Intro

Compare those specs to the Geforce GTX 680, which has core clock speeds of 1006 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

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

Performance-wise, the Geforce GTX 680 should in theory be much better than the GeForce GTX 285 1GB overall. (explain)

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

Texel Rate

The Geforce GTX 680 should be a lot (approximately 148%) more effective 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 should be quite a bit (approximately 55%) more effective at FSAA than the GeForce GTX 285 1GB, and also should be capable of handling higher resolutions better. (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 MB per second) that can be transported over the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.