Well, 32 bits at 33MHz would be:

32 bits * 33,000,000 per second * ( 1 kb / 1024 bits ) * ( 1 mb / 1024 kb ) ==
32 * 33,000,000 / 1024 / 1024 ==
1007 mbps

Full duplex gigabit ethernet would be 2 gigabits, so you've got, at best, half capacity (distributed any way you want, though), assuming that you don't have any other traffic on that PCI bus.