GeForce 8800 GT 256MB vs GeForce GT 320

Intro

Compare those specs to the GeForce GT 320, which has core clock speeds of 540 MHz on the GPU, and 790 MHz on the 1024 MB of GDDR3 memory. It features 72 SPUs as well as 24 TAUs and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 320		43 Watts
GeForce 8800 GT 256MB		105 Watts
	Difference: 62 Watts (144%)

Memory Bandwidth

As far as performance goes, the GeForce 8800 GT 256MB should in theory be quite a bit better than the GeForce GT 320 overall. (explain)

GeForce 8800 GT 256MB		44800 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 19520 (77%)

Texel Rate

The GeForce 8800 GT 256MB is quite a bit (approximately 159%) better at texture filtering than the GeForce GT 320. (explain)

GeForce 8800 GT 256MB		33600 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 20640 (159%)

Pixel Rate

The GeForce 8800 GT 256MB should be much (more or less 122%) better at FSAA than the GeForce GT 320, and capable of handling higher resolutions while still performing well. (explain)

GeForce 8800 GT 256MB		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 maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, 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 one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.