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Memory Interface 128, 256, and 384 bit

post #1 of 4
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Can anyone explain these in more detail besides the fact that the higher numbers offer more overhead and lessen the chance of a bottle neck?
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Stealth 5GHz
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post #2 of 4
"It is one of three items that define the Memory Bandwidth, the other two being the type of RAM and the speed of the RAM.

Just because a GPU has a wider memory bus does not mean however that it has more memory bandwidth.
As an example, the GTX 260 has a 448 bit memory bus and 111.9GB/s bandwidth where the 4890 has a 256 bit memory bus and 115.2GB/s bandwidth.
This is because the 4890 uses GDDR5 RAM as compared to GDDR3 on the GTX 260. "

-Source Toms

Even though it uses old graphics cards as and example, the concept is the same. The "memory interface" allows the GPU to address and move more memory per cycle, but the memory itself works at a certain speed. So, to achieve a certain "memory bandwidth" you have to mix both: speed and interface. That's the GB/s a card has for internal memory movement, which is the bottom line regarding the memory bandwidth.

I hope that answers your questions.
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post #3 of 4
yea please and the Core Clock and Effective Memory Clock and shader
post #4 of 4
Clockspeed multiplied by bit-width equals bandwidth. Therefore to increase bandwidth, you increase either clockspeed, bit-width or both. Note that some clocks are double or quad pumped, so effective clockspeed is twice the clockspeed (i.e. DDR3 and GDDR5).
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