For all the neo 4 series boards the problem was fixed with the new bios releases. u can read this over at creatives' forums . infact msi was one of the first ones to fix this issue. here's a link...http://forums.creative.com/creativelabs/board/message?board.id=soundblaster&message.id=26289&view=by_date_ascending&page=1
it was more than 40 pages sincei last checked and i bet it's even larger now.
the thing to look out for is that u need the xi-fi with a heatsink on the spu (sound processing unit?). thats the newer one with minimal problems. also if u go for models with x-ram then u should be okay, as they had no problems to begin with.
ps, just checked it has over 50 pages!!!