GeForce 8800 GTS (G80) 640MB vs GeForce GTX 460

Intro

Compare those specifications to the GeForce GTX 460, which features GPU core speed of 675 MHz, and 768 MB of GDDR5 RAM running at 900 MHz through a 192-bit bus. It also is made up of 336 Stream Processors, 56 TAUs, and 24 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 640MB		143 Watts
GeForce GTX 460		150 Watts
	Difference: 7 Watts (5%)

Memory Bandwidth

In theory, the GeForce GTX 460 should perform quite a bit faster than the GeForce 8800 GTS (G80) 640MB in general. (explain)

GeForce GTX 460		86400 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 23040 (36%)

Texel Rate

The GeForce GTX 460 is a lot (more or less 54%) more effective at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 460		37800 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 13176 (54%)

Pixel Rate

The GeForce GTX 460 will be quite a bit (about 58%) better at FSAA than the GeForce 8800 GTS (G80) 640MB, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 460		16200 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 5940 (58%)

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 maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, 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 by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out 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 filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.