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What is "data bus width"?

post #1 of 7
Thread Starter 
Well, I was just skimming over the details page in 3dmark03, and found this, and was just curious how much my motherboards AGP settings are hurting performance. My card is a 9600xt, which is 128 bit card, is that the "data bus width"? Oh yeah, it is also limited to 4x, no 8x.

Slot 1/4 (AGP)
RADEON 9600 Series (Omega 3.8.205)
Order 0
Designation AGP
Type AGP
Characteristics 5.0V, PME Signal
Data Bus Width 32 b<<<<<<<<<<<<<<<<<
Details In Use, Long
Device Class Display Adapter
Manufacturer ATI Technologies Inc. (Omega 3.8.205)
Driver Version 8.205.0.0
Driver Date 1-4-2006
IRQ 16
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post #2 of 7
Well, I can fairly confidently say that the AGP data rate don't, X4 bandwidth is plenty and enough to supply enough bandwidth to your card, without bottlenecking it.
Hope i helped.
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post #3 of 7
AGP 8x will give you better performance but it sounds like your motherboard doesnt support it. It wouldnt be worth buying a agp 8x board as when upgrading in the future hardly any new cards will support AGP, so I would go with PCI express.

The data bus width is the amount of bits that can be sent simultanously by the GPU.
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post #4 of 7
Thread Starter 
does this mean that instead of running at 128 bit which my card is capable of, it's running at 32 bit instead? That's mostly what I need to know. Thanks again guys.
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post #5 of 7
Thread Starter 
so does anyone know if my 128-bit card is being limited by the 32-bit data bus of my motherboard? Or is the data bus width have more to do with, let's say, how windows comes in 32-bit or 64-bit versions? I don't know, hopefully someone can help me on this one. Thanks.
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post #6 of 7
The answer is no!.
Not only that an AGP data rate of X4 instead of X8 doesn't make much of a difference with your card, but it's also only indicates of the amount of memory the card can transform to the north bridge(chipset) in a second(bandwidth).
That's how come it's called data rate.
The concept of 'memory bus width' however is a whole different thing,
It has no link to the AGP data rate, and it's completely independent!,
Those figures represent the capacity of the capacity of the internal memory which is on the card to write data, Unlike AGP data rate it does not involved
communications with the chipset!.

The mobo that appears in your sustem specifications is Nforce 3 based, and it modt definatlly suppots AGP X8,
How ever please take into ammount that that swaping to AGP X8 data rate will only provide you with addtional 100 3dmarks 05', at best.
Also consider that AGP X8 data rate is much less stable then AGP X4,
and it often causes crashes, which increased by overclocking.
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post #7 of 7
Thread Starter 
thanks alot man for clearing that up. Oh, and this is a different system than the one in my sig
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