I think they're doing that because they have 2 BIOS on the board. If your BIOS install goes South then you can just revert back to the older one.
I think it's a great idea but I don't know how well it works in practice. Honestly, I hope I never find out..
Still, I've only had one BIOS upgrade bad on me and the cost of the replacement chip was more than the mobo was worth. Given that the board I bought was $125 shipped with a 1600+ I don't think it'll be cost effective to try and replace the chip on this board either even if the backup BIOS doesn't work if thing do indeed go south.
My only real question now (besided longevity and reliablity) is will the new mobo combination (512 megs CAS2 pc133 and a 1.4 ghz XP processor)perform about the same as the my old one - a 1.2ghz T-Bird with 512 megs of DDR. I'm just wondering if the 200mhz difference will make up for the slower memory. I'll be using identical drives in both computers. Still, I suppose it's a moot point - I was running Slack on a 1.0 ghz celeron with 384 megs of ram and was blown away by it's performance. Something tells me I won't notice the difference. :-)
Edit: I also hope the onboard sound sounds good too..