This depends on a number of factors:
1. Is CPU capable of bursting data to north bridge? Normally, answer is Yes.
2. Is the bridge capable of bursting data to the PCI device? It may or may NOT. You have to check the manual to find out how to turn the feature on if it provides that feature.
3. Is the PCI device capable of accepting data burst? If it does NOT, it will never have a burst on PCI Bus.