P4 boards were the first to use 24pins instead of the then 20pin standard. Once AMD adopted the additional 12v cpu feed on the Socket 754 models and later saw the 24pin power connectors on the 939 models all new boards use the 24pin standard.
There's an Abit micro atx model mixed in with the two oipen box and one retail Bopstar models seen at
http://www.newegg.com/product/Produc..._-NA-_-NA-_-NA
Abit is one of the better but not top makes. But that is still a micro not full sized model. If you look at shopping sites, Amazon, and certainly EBay you'll find plenty of 478 boards while some odd names of makes besides Intel, Biostar, and a pair of MSI can be seen in the two pages at
http://computers.pricegrabber.com/mo...socket/st=page