GeForce 8800 Ultra vs GeForce GT 320

Intro

Compare those specs 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 works at a frequency of 790 MHz on this particular card. 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 Ultra		171 Watts
	Difference: 128 Watts (298%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 Ultra will be 310% faster than the GeForce GT 320 overall, because of its greater bandwidth. (explain)

GeForce 8800 Ultra		103680 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 78400 (310%)

Texel Rate

The GeForce 8800 Ultra is much (about 202%) better at AF than the GeForce GT 320. (explain)

GeForce 8800 Ultra		39168 Mtexels/sec
GeForce GT 320		12960 Mtexels/sec
	Difference: 26208 (202%)

Pixel Rate

The GeForce 8800 Ultra will be quite a bit (about 240%) better at full screen anti-aliasing than the GeForce GT 320, and capable of handling higher screen resolutions better. (explain)

GeForce 8800 Ultra		14688 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 10368 (240%)

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 information (counted in megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could 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 ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.