Very strange I had a problem on my first Striker between 490x10 and 453x10. I have not seen any holes in the higher ranges on my new board and ran a SuperPi 1m last night at 4601 without issue. Ill play around and see if I can find some holes this weekend and then document my findings.
Not the greatest SuperPi in the world but not too far off the 975x mobos either...
http://thumbsnap.com/t/dFNQNBiw.jpg