GeForce GTX 285 1GB vs Geforce GTX 680

Intro

Compare those specs to the Geforce GTX 680, which features core speeds of 1006 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 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

Theoretically speaking, the Geforce GTX 680 should perform much faster 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 is quite a bit (about 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%) better at anti-aliasing than the GeForce GTX 285 1GB, and should be able to handle higher screen resolutions while still performing well. (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 maximum amount of information (counted in MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.