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How Do You Find The Bandwidth Of Graphics Cards

post #1 of 8
Thread Starter 
ok my question is about the Bandwidth of Graphics card that is used with the PCI-E bus.

now the memory bandwidth can easily be found but to my knowledge that is not the bandwidth thats used by the PCI-E Bus

how do you find out the bandwidth that GPU's use for the PCI-E bus???
Edited by rammunition - 12/23/08 at 3:50am
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post #2 of 8
wikipedia has tables that show stats for a variety of cards. I believe the bandwith of the memory usually represents the maximum throughput of the card, as this is usually the bottleneck. i very well could be wrong. Are you looking for "bus width?" (128 bit, 448 bit, etc?). A combination of fillrate, mem bandwidth & bus width, and raw power (gflops) will give you a good idea about the relative performance of a card.

http://en.wikipedia.org/wiki/Geforce

just click on the generation you want to view.
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post #3 of 8
Quote:
Originally Posted by rammunition View Post
ok my question is about the Bandwidth of Graphics card that is used with the PCI-E bus.

now the memory bandwidth can easily be found but to my knowledge that is not the bandwidth thats used by the PCI-E Bus

how do you find out the bandwidth that GPU's use for the PCI-E bus???
Run a benchmark.
Cover up a few PCIe lanes with tape.
Run the benchmark again.
Cover up a few more PCIe lanes with tape.
Repeat until you lose performance.

You know know the range of your bandwidth....

Tomshardware did this test awhile back.


Quote:
Originally Posted by TehStone View Post
wikipedia has tables that show stats for a variety of cards. I believe the bandwith of the memory usually represents the maximum throughput of the card, as this is usually the bottleneck. i very well could be wrong. Are you looking for "bus width?" (128 bit, 448 bit, etc?). A combination of fillrate, mem bandwidth & bus width, and raw power (gflops) will give you a good idea about the relative performance of a card.

http://en.wikipedia.org/wiki/Geforce

just click on the generation you want to view.
That bandwidth is for GPU core to the onboard video memory.
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post #4 of 8
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
Run a benchmark.
Cover up a few PCIe lanes with tape.
Run the benchmark again.
Cover up a few more PCIe lanes with tape.
Repeat until you lose performance.



woah!!!!!

something a bit simple, maybe a chart or something

are there no charts or graphs of the average bandwidth of GPU's???

also if the max bandwidth of the pci-e 1.1 bus 2.5GB/s or 250GB/s, or something like that??
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post #5 of 8
PCI-E (x16) 4000MB/s, PCI-E 2.0 (x16) 8000MB/s theoretical.
    
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post #6 of 8
How about using GPU-Z? It displays all of the GPU's 'bandwidth' capabilities : leik: mem bandwidth and shader bandwidth.
post #7 of 8
Thread Starter 
but doesn't the pci-e bus not use the shader/memory bandwidth???
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post #8 of 8
PCI-E bandwidth is totally different from GPU bandwidth..and wont change, unless you OC your PCI-E freq on the mobo
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