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Fill Rate, Memory Bandwidth?

post #1 of 8
Thread Starter 
I am sorry to ask this noob question.
can someone please tell me what is the Fill rate and Memory Bandwidth mean? and what they do?
http://www.hisdigital.com/html/product_comp.php?id=267
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post #2 of 8
Thread Starter 
anyone know?
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post #3 of 8
Yes

Quote:
Fill rate is the number of pixels that can be rendered per second. (Pixels, or "picture elements," are literally the dots that appear on your computer display.) The process of rendering a pixel entails performing all of the 3D operations necessary to calculate the correct color for that pixel. At a resolution of 1024 x 768, thousands of pixels are actually displayed on the screen (786,432 to be exact). It's easy to see that the pixel fill rate is directly related to a game's frame rate, or the number of frames that are drawn in a second. In order to experience games at their peak levels, your card must have the ability to sustain an extremely high pixel fill rate. Low frame rates produce stuttered motion and a poor experience. High frame rates, especially 60frames per second and higher, produce fluid, realistic motion and a much better experience. A 3D accelerator card with extremely high pixel fill rates is a must for serious gaming action.
more to come when i get done reading on it
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post #4 of 8
Quote:
One of the main things you need to consider when selecting a video card is the memory bandwidth of the video RAM. Memory bandwidth is the rate at which the GPU can access the video memory. It's measured in gigabytes per second (GB/s). The more memory bandwidth you have, the better. A video card with higher memory bandwidth can draw faster and draw higher quality images. But there's more to video cards than just memory bandwidth. You also have to consider the drawing speed of the GPU. There's little point in getting a video card with a very fast GPU and limited memory bandwidth because the memory will be the bottleneck. By the same token, you don't want to get a video card with a slow GPU and very high memory bandwidth. This page addresses only the subject of memory bandwidth.

The memory bandwidth is determined by the memory clock, the memory type, and the memory width. The memory clock is the clock rate of the memory chips. Current (2006) memory chips have clock rates which range from about 167MHz to 850MHz. The most common memory type is double data rate (DDR) which means that it transfers two memory values for each memory clock cycle. There are also other kinds of DDR like DDR2 and GDDR3 and they also transfer at twice the memory clock rate. Some very old video cards still use single data rate (SDR) which transfers one value per clock cycle. The memory width of the common cards range from 32 bits to 256 bits. The maximum theoretical memory bandwidth is the product of the memory clock, the transfers per clock based on the memory type, and the memory width. For example, a video card with 200MHz DDR RAM which is 128 bits wide has a bandwidth of 200MHz * 2 * 128 bits which is 6.4GB/s.
oky
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post #5 of 8
Thread Starter 
thx alot, that was a good read. REP+

Also i have a question, How Come the X1950XT have higher Fill Rate than X1950XTX?

Link up there i post, X1950XT have 30G Pixel/s and XTX have 10G Pixel/s.
http://www.hisdigital.com/html/product_comp.php?id=246
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post #6 of 8
I don't see 30G P/s

Quote:
Fill Rate 10GPixel/s 10GPixel/s 10GPixel/s 6.9GPixel/s 10GPixel/s
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post #7 of 8
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IronMan
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post #8 of 8
Must be a typo or something.. a 8800GTX has 36.8 billion/sec
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