GeForce 8800 GTS (G80) 640MB vs GeForce 8800 GTS (G92)

Intro

Compare all of that to the GeForce 8800 GTS (G92), which has GPU clock speed of 650 MHz, and 512 MB of GDDR3 RAM running at 970 MHz through a 256-bit bus. It also is made up of 128 Stream Processors, 64 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G92)		135 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 8 Watts (6%)

Memory Bandwidth

Theoretically, the GeForce 8800 GTS (G80) 640MB should perform a bit faster than the GeForce 8800 GTS (G92) overall. (explain)

GeForce 8800 GTS (G80) 640MB		63360 MB/sec
GeForce 8800 GTS (G92)		62080 MB/sec
	Difference: 1280 (2%)

Texel Rate

The GeForce 8800 GTS (G92) should be a lot (about 69%) more effective at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce 8800 GTS (G92)		41600 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 16976 (69%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 8800 GTS (G92) is a better choice, but not by far. (explain)

GeForce 8800 GTS (G92)		10400 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 140 (1%)

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 information (measured in megabytes per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.