Yes there are some problems with nonstandard FSB's. The mainboards work better at a standard FSB like 800, 1066, 1333, or 1600, since they were optimized to work at that FSB.
There are multipliers also for PCI, PCI-E, if you let the mb on PCI-E on auto I thought your ATI's doesn't get along well on the frequencies set by the MB.
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