Audio drop outs.... again!

How did you actually solve this? I have an ASUS EAX card next to an NVS 285 and each time I move windows on that card, it creates audio drops out… My primary card sits in a PCI-X as well as the NVS?
specs
16 GB RAM/ AMD@3.2ghz six core / 4 x 500 GB HD

kind regards
Steve