GeForce 8800 GT 512MB vs GeForce GTX 285 1GB

Intro

Compare those specifications to the GeForce GTX 285 1GB, which features a clock speed of 648 MHz and a GDDR3 memory frequency of 1242 MHz. It also features a 512-bit bus, and makes use of a 55 nm design. It features 240 SPUs, 80 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 512MB		105 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 99 Watts (94%)

Memory Bandwidth

In theory, the GeForce GTX 285 1GB should be 176% quicker than the GeForce 8800 GT 512MB in general, due to its higher data rate. (explain)

GeForce GTX 285 1GB		158976 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 101376 (176%)

Texel Rate

The GeForce GTX 285 1GB should be quite a bit (about 54%) faster with regards to texture filtering than the GeForce 8800 GT 512MB. (explain)

GeForce GTX 285 1GB		51840 Mtexels/sec
GeForce 8800 GT 512MB		33600 Mtexels/sec
	Difference: 18240 (54%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GTX 285 1GB is the winner, and very much so. (explain)

GeForce GTX 285 1GB		20736 Mpixels/sec
GeForce 8800 GT 512MB		9600 Mpixels/sec
	Difference: 11136 (116%)

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 max amount of data (measured in MB per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 memory bandwidth is, the lower the potential to reach the max fill rate.