2008/10/4 Ellis Wilson <[EMAIL PROTECTED]> > Bruno Coutinho wrote: > > You need to get data from machine main memory, compress and send results > > back several times. > > The bandwidth of pci express today is 8GB/s, so this is the maximum data > > rate a gpu can compress. > > You can use some tricks like computation and i/o (to main memory) > > parallelization, but will be constrained to 8GB/s anyway. > > Check out PCI Express 2 then, you'll get 16GB/s bandwidth but I'm not > sure all the GPU's are moved that direction yet. >
This is in a x32 slot (that I never saw) in a typical x16 slot pci-e 1.0 make 4GB/s and 2.0 makes 8GB/s. All nvidia cards from 9 series and ATI from 3xxx series have pci express 2.0. In chipsets only the newest ones like intel P45 have pci-e 2.0.
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