Yes, I only have a Beigey, not a Bluey (the B&W CPU I mentioned is just one I picked up, I don't actually have a B&W machine). Ah, yes, the jumpers - do I just leave them at the current setting of 66 MHz bus/400 MHz CPU, as the Sonnet chips ignore the jumpers and configure themselves don't they? If someone could confirm this that would be very helpful, as it didn't come with any instructions and I can't find any on the Sonnet website!