DIfference between NF2 SPP and Ultra 400

[Avalon]

Just like the title says, I was wondering what the difference is. I was reading through the official NF7-S thread for quite some time, since I may be possibly going with that board, but could not find the answer. Reason I'm asking is on Newegg I see the board under two different chipsets, and wanted to know what the difference was. Also, will NF7-S boards occassionally be able to reach a FSB of 250? Thanks.