Which revision number is the better one?

[tomatoeboy]

and the old board seems long gone...?

a side effect of the old board software apparently,

Anyhow, the revision no of your board should be on a white sticker down the side of the brown ISA slot. I believe that the Rev. 1.1 boards (of which I have 1) are slightly more stable than the Rev 1.0 boards.

That said I think it really depends on the individual board. The 0.41 revision no you talk about & is on the web page I can't really say about as I don't know

[cyop]

For the most part, all Abit BP6 mainboards have poor voltage regulation.

If you are having sever problems, of course, discover what it is, if you can. May just be that. Especially when using some graphics accelerators.