A ISA bus running at 33MHz will move 33 x 2 x 8 bytes
per second = 528
bits per second which is more than enough to keep a 100Mhz card running
- and even a gigbit card will get nowhere like 1000M bits per second
You may mean the ISA bus will move 528 Mbits per second, which is enough for
a 100Mbit card, although I've probably confused something now as well...