Hi, thanks for answering. No, bios only indicates enabled/disabled for HPET. The MB, which I just put in last week, comes with disappointingly few possible user settings in the bios (& I did make sure I had the latest update). In fact, the only mention of 64 I can find is under PCI Subsystem Settings: PCI Latency Timer is set to 64; the possible settings are 32, 64, 96, 128, 160, 192, 224, 248—I don't really know what that means. I don't have anything inserted into a PCI slot. I do have a Firewire card in a PCIe x1 slot, however, and that's connected to my audio interface (Tascam FW-1082) which controls everything having to do with audio in the studio. I guess I could increase the PCI Latency Timer, and that may resolve my popping audio issue, but I can't see how it's relevant to the HPET.... Anyway, I won't do anything until I hear back from you. Thanks again.