Anybody got this combination working?

I know the SiliconExpress IV is working fine, as I plugged it into a PPC Mac (I think it was a 7100? @ 80Mhz) and I was getting a nice 8-9MB/sec sustained rate with a fast SCSI drive off the 68pin port.

However, when I put the card in a Quadra 650 motherboard, it doesn't appear in any of the 3 NuBus slots (C, D, E) with any of the software I tried (Apple Diag, etc).

I also updated the firmware of the card to the latest official (1.65)

Any thoughts?