Are the listed transfer rates accurate?

[2048Megabytes]

Are the below listed transfer rates accurate?

Bus Maximum Transfer Rate

PCI - 133 megabytes/second
AGP 2x - 533 megabytes/second
AGP 4x - 1,066 megabytes/second
AGP 8x - 2,133 megabytes/second

PCI Express x1 - 250 megabytes/second
PCI Express x2 - 500 megabytes/second
PCI Express x4 - 1,000 megabytes/second
PCI Express x16 - 4,000 megabytes/second
PCI Express x32 - 8,000 megabytes/second

 

[Calibretto]

I would check this out:

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