[axiolite]

> one could easily overload the -12V bus

People can easily overload 12V motherboard fan headers, too.

> if they are trying to get a lot of CFM.

If so, they probably have a PSU larger than the entry-level 350W unit I specified. Higher wattage PSUs will provide more power on the -12V rail as well.

> I don’t see a compelling reason to use 24V

Neither does anyone else. Still, correcting a bit of misinformation in the article.