I would suggest that you get you money back now, if you still can. I think the promise controller is a POS. Once you experience the data corruption, stuttering audio, BSOD, etc, etc, you'll see why.
I have used both the 66 and 100 and never experienced any of the symptoms you describe.
Maybe you didn't install the drivers right or your Power supply was not quite up to Par, or your Motherboard had a faulty PCI slot.
I can't even beleive you would say such a thing.
Ignore those comments, because they simply aren't true.
Many people here use the 66 or 100 card without a lick of problems.