GeForce 9800 GT 1GB vs GeForce GT 320

Intro

Compare that to the GeForce GT 320, which has a core clock speed of 540 MHz and a GDDR3 memory speed of 790 MHz. It also features a 128-bit memory bus, and uses a 40 nm design. It features 72 SPUs, 24 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
GeForce 9800 GT 1GB		105 Watts
	Difference: 62 Watts (144%)

Memory Bandwidth

In theory, the GeForce 9800 GT 1GB is 128% faster than the GeForce GT 320 overall, because of its higher data rate. (explain)

GeForce 9800 GT 1GB		57600 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 32320 (128%)

Texel Rate

The GeForce 9800 GT 1GB will be much (about 159%) more effective at texture filtering than the GeForce GT 320. (explain)

GeForce 9800 GT 1GB		33600 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 20640 (159%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce 9800 GT 1GB is the winner, by a large margin. (explain)

GeForce 9800 GT 1GB		9600 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 5280 (122%)

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 data (measured in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 are processed per second. This number is calculated by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.