GeForce GT 220 GDDR3 vs GeForce GT 320

Intro

Compare those specs to the GeForce GT 320, which features a core clock speed of 540 MHz and a GDDR3 memory frequency of 790 MHz. It also features a 128-bit bus, and uses a 40 nm design. It is comprised of 72 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

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 should be a lot faster than the GeForce GT 320 in general. (explain)

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

Texel Rate

The GeForce GT 320 will be quite a bit (more or less 30%) more effective at AF 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 lots of anti-aliasing is important to you, then the GeForce GT 220 GDDR3 is the winner, though 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 information (in units of megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total 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 amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.