Actually not quite true.  SBus I/O speed rivals that of PCI.  Not only
that, but SBus does not suffer from certain other deficiencies that impact
PCI performance when multiple devices are active.  Slow chips on either
side of the bus starving it is completely another matter.

> There's little point in trying to get new chipsets running on SBus
> cards.  It's a bit like putting a set of modern high performance racing
> tires on a model T.  The host machines and backplanes usually can't handle
> it.  
>
> If you want better performance you should go with a PCI machine and use
> the PCI cards, or go whole hog and use UPA graphics adapters.
> 
> 
> Eduardo Horvath				   
> 
> 
>