GeForce GT 220 GDDR3 vs GeForce GT 320

Intro

Compare those specs to the GeForce GT 320, which has a core clock speed of 540 MHz and a GDDR3 memory frequency of 790 MHz. It also makes use of a 128-bit memory bus, and uses 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

Performance-wise, the GeForce GT 220 GDDR3 should in theory be quite a bit better than the GeForce GT 320 overall. (explain)

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

Texel Rate

The GeForce GT 320 is much (approximately 30%) faster with regards to 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 running with a high resolution is important to you, then the GeForce GT 220 GDDR3 is a better choice, 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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred over 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 memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.