GeForce 8800 GTS (G80) 640MB vs GeForce GT 320

Intro

Compare that to the GeForce GT 320, which makes use of a 40 nm design. nVidia has clocked the core speed at 540 MHz. The GDDR3 RAM is set to run at a speed of 790 MHz on this card. It features 72 SPUs along with 24 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
GeForce 8800 GTS (G80) 640MB		143 Watts
	Difference: 100 Watts (233%)

Memory Bandwidth

As far as performance goes, the GeForce 8800 GTS (G80) 640MB should theoretically be much better than the GeForce GT 320 in general. (explain)

GeForce 8800 GTS (G80) 640MB		63360 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 38080 (151%)

Texel Rate

The GeForce 8800 GTS (G80) 640MB is quite a bit (more or less 90%) faster with regards to texture filtering than the GeForce GT 320. (explain)

GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 11664 (90%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 8800 GTS (G80) 640MB is superior to the GeForce GT 320, and very much so. (explain)

GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 5940 (138%)

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: Bandwidth is the max amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the 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 are applied per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.