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128-bit vs. 256-bit vs. 320-bit

post #1 of 9
Thread Starter 
REALLY sorry if this is already posted, but I tried to search for it and couldn't find anything.

In graphics cards, what does the memory bit size affect the most?

Compared to VRAM mattering the most in bigger resolutions, is there anything that these bit sizes affect greatly?

Thanks for your input!
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post #2 of 9
I believe it allows for more bandwidth.
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post #3 of 9
It would be like going from DDR to DDR2 to DDR3. It allows data to be transfered faster (or more data to be transfered at once) between the memory on the graphics card and the GPU. It would be like turning a 2 lane highway into a 4 lane highway.
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post #4 of 9
Thread Starter 
So say I was gaming with a 128-bit card and compared to a 256-bit card otherwise identical, would there be noticeable differences?

Thanks for the quick reply
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post #5 of 9
You probably wouldn't notice any difference up to a point. If you're running lower detail and lower res stuff, then the bandwidth wouldn't have any problems at 128 bit. But once it starts needing to get more data through in higher res, higher detail situations, then the 256 bit will make a noticeable improvement.
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post #6 of 9
If you say you had a 8800GTS in 128bit version and 320bit buying the 128 although cheaper would bottleneck the card

If it's say a 6800 in same position it probably wouldn't effect the card much ..
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post #7 of 9
Thread Starter 
Ok thanks for the tips, I was just wondering because my friend thinks its one of the most important parts of the gfx card and the best 128-bit card won't beat the worst 256-bit card.
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post #8 of 9
I think it matters most at high resolutions, or with high res textures, for instance if you ran the 8600GTS vs. the x1950pro on oblivion with Qarl's texture pack both cards would choke but I bet the 8600 would choke worse.
post #9 of 9
Quote:
Originally Posted by foslock View Post
Ok thanks for the tips, I was just wondering because my friend thinks its one of the most important parts of the gfx card and the best 128-bit card won't beat the worst 256-bit card.
That statement is way to generalized. There are a number of factors that affect video card performance:

Architecture
Number of shaders
Core Speed
Memory Speed
Memory Bus
Memory Type
Memory Size
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Once again...
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