Wow, I am new here, and just finished reading this thread.
Looks like only one guy managed to master this board and run it at 500FSB 24/7 with a quad. There were some few people showing their quads at 490-500fsb, but without any stability tests, so that means nothing.
Here is
simps's quad, and its pretty much the only one I found on this entire thread, running 500fsb 100% stable.
494FSB (wtf, his board volts are so low for that fsb)
http://img297.imageshack.us/img297/5383/4945ju6.jpg
He is aircooled he said, that is really impressive. I can't make my quad 500fsb stable on this board, even with lower cpu clocks.