GeForce 8800 GT 512MB vs GeForce 8800 GTS (G80) 640MB

Intro

Compare those specifications to the GeForce 8800 GTS (G80) 640MB, which makes use of a 90 nm design. nVidia has set the core speed at 513 MHz. The GDDR3 RAM runs at a speed of 792 MHz on this specific model. It features 96 SPUs along with 48 TAUs and 20 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GT 512MB		105 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 38 Watts (36%)

Memory Bandwidth

Performance-wise, the GeForce 8800 GTS (G80) 640MB should in theory be a small bit superior to the GeForce 8800 GT 512MB overall. (explain)

GeForce 8800 GTS (G80) 640MB		63360 MB/sec
GeForce 8800 GT 512MB		57600 MB/sec
	Difference: 5760 (10%)

Texel Rate

The GeForce 8800 GT 512MB is a lot (more or less 36%) more effective at texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce 8800 GT 512MB		33600 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 8976 (36%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce 8800 GTS (G80) 640MB is superior to the GeForce 8800 GT 512MB, but only just. (explain)

GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
GeForce 8800 GT 512MB		9600 Mpixels/sec
	Difference: 660 (7%)

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 (counted in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.