GeForce GT 220 GDDR3 vs GeForce GT 320

Intro

Compare all of that to the GeForce GT 320, which comes with a clock frequency of 540 MHz and a GDDR3 memory speed of 790 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It is made up of 72 SPUs, 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 GT 220 GDDR3		58 Watts
	Difference: 15 Watts (35%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 220 GDDR3 is 28% faster than the GeForce GT 320 overall, due to its greater data rate. (explain)

GeForce GT 220 GDDR3		32384 MB/sec
GeForce GT 320		25280 MB/sec
	Difference: 7104 (28%)

Texel Rate

The GeForce GT 320 is quite a bit (more or less 30%) better at anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

GeForce GT 320		12960 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 2960 (30%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GT 220 GDDR3 is the winner, but not by far. (explain)

GeForce GT 220 GDDR3		5000 Mpixels/sec
GeForce GT 320		4320 Mpixels/sec
	Difference: 680 (16%)

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 largest amount of data (in units of MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.