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Bit rate on grphics cards

post #1 of 5
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Can someone with a little knowledge perhaps explain to me the differences in the bit rates on graph cards ? .... such GTS450 1gb GDDR5 128bit " <--- like that. And does it help to have higher bit rate for better performance??
post #2 of 5
It basically means this - the more bits, the faster the communication is between the memory and the GPU. The bits don't define the performance, but higher is generally better.
post #3 of 5
That rate does not equal raw card performance (that is defined by amount of shaders), but as Broseidon has stated, the higher this number, the faster the communication between GPU and VRAM would be.
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post #4 of 5
Quote:
Originally Posted by fix0r75 View Post
Can someone with a little knowledge perhaps explain to me the differences in the bit rates on graph cards ? .... such GTS450 1gb GDDR5 128bit " <--- like that. And does it help to have higher bit rate for better performance??

that is a very hard question because the subject is extremely complex


on old video cards, having higher bit means it has higher performance

but when gpu's becomes more complex, the bit width isn't that as significant as before because of technologies such as GDDR5


its like when nvidia have 512bit GDDR3 on GTX 280 while ATI only has 256 Bit GDDR5 on HD 4870. theoretically the 512bit GDDR3 will produce more bandwidth but at the cost of higher manufacturing cost which translates into more expensive video cards(remember the MSRP cost of GTX 280 at launch at $649?)

today, the bus width could be used to tell which is better on the same type of gpu especially in lowend

ex. GT 430 64bit DDR3 < GT 430 128bit DDR3
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post #5 of 5
Higher bus width usually means the card has a higher memory bandwidth capability. However, other factors such as RAM type and RAM speed affect it too.
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