My modprobe.conf contains the following lines
alias char-major-81-2 bttv
alias char-major-81-3 bttv
alias char-major-81-4 bttv
alias char-major-81-5 bttv
options bttv card=94,94,94,94 pll=1
alias char-major-81-6 bttv
alias char-major-81-7 bttv
alias char-major-81-8 bttv
alias char-major-81-9 bttv
options bttv card=42,42,42,42 pll=1 radio=0 tuner=4 sloppy=1 chroma_agc=1 mmap=1 vbibufs=4 v4l2=1 gbuffers=16
This is for two cards, the Spectra and a LML one. I forget which config applies to which but if yours doesn't match either then you could try them both and see which one works. I've never had a reboot at all on this box, except when I've asked for one and I've done some pretty nasty to things to the cards while developing ZM as you can imagine

Phil