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Proper GPU bandwidth interpretation

Last response: in Graphics & Displays
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December 14, 2010 11:02:08 AM

Hi All,

I was researching on how GT 240 GDDR3 differed with its GDDR5 counterpart and if having PCI 1.0 -> 3.0 would matter as a bottleneck.

Here are the bandwidth i got from wikipedia:

PCI Express 1.0 (x32 link) = 64 Gbit/s 8 GB/s
PCI Express 2.0 (x16 link) = 64 Gbit/s 8 GB/s
PCI Express 3.0 (x16 link) = 102.4 Gbit/s 12.8 GB/s
PCI Express 2.0 (x32 link) = 128 Gbit/s 16 GB/s

What I want to understand is how the computation really works, since the rated Bandwidth, say for the GT 240 GDDR5, is at 54.4 GB/s, which is so much higher than those specified by the bus bandwidth capcities.

http://en.wikipedia.org/wiki/GeForce_200_Series

Help how to interpret these numbers?
a b U Graphics card
December 14, 2010 1:20:38 PM

The card bandwidth is the memory bandwidth, it's got nothing to do with the pci-e slot.
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