This is what I found:
"IOBlix cards that were manufactured later than September 1999, have a "Firmware 2.0" sticker on the back, or a barcode with a serial number starting 004."
@Tahoe, excuse my ignorance, but, why should you need a version 2.0 instead of a 1.3? Are there any notable differences between them?
I also have the same card. Not sure which revision is, but i could check when i get home (sorry @goldfish for the hijack thread)

Regards
Sebastian