GeForce 8800 GTS (G80) 640MB vs GeForce GTX 480

Intro

Compare that to the GeForce GTX 480, which features a core clock speed of 700 MHz and a GDDR5 memory frequency of 924 MHz. It also features a 384-bit memory bus, and makes use of a 40 nm design. It is made up of 480 SPUs, 60 Texture Address Units, and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 640MB		143 Watts
GeForce GTX 480		250 Watts
	Difference: 107 Watts (75%)

Memory Bandwidth

The GeForce GTX 480 should in theory be quite a bit faster than the GeForce 8800 GTS (G80) 640MB overall. (explain)

GeForce GTX 480		177408 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 114048 (180%)

Texel Rate

The GeForce GTX 480 is a lot (about 71%) more effective at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 480		42000 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 17376 (71%)

Pixel Rate

The GeForce GTX 480 is a lot (approximately 227%) better at AA than the GeForce 8800 GTS (G80) 640MB, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 480		33600 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 23340 (227%)

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 largest amount of data (measured in MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.