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

Intro

Compare those specifications to the GeForce GT 320, which has GPU core speed of 540 MHz, and 1024 MB of GDDR3 RAM set to run at 790 MHz through a 128-bit bus. It also is comprised of 72 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

Hide Graphs

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

In theory, the GeForce 8800 GTS (G80) 640MB is 151% faster than the GeForce GT 320 in general, due to its higher data rate. (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 should be much (approximately 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

The GeForce 8800 GTS (G80) 640MB is a lot (about 138%) faster with regards to AA than the GeForce GT 320, and also capable of handling higher resolutions without losing too much performance. (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 information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.