Adding identical PCIE Avermedia m780 fails? not sure what happens

I put in the card, windows device manager just shows one card having three entries?

I have a vbox 3560, avermedia m780. Added another m780. WMC complains 'tuner2' has no signal.
Which one is 'tuner2'?
It could never see both avermedia m780. it just worked as before like it only had 2 tuners

Should device manager have shown 6 entries if two avermedia m780 cards were installed?

So pull it out.
I have now gotten a Hauppage 1250 pcie.
Can I install that card and not have to go through TV setup completely again?
Can I just do a check for new channels rescan?

I saw an option where you could scan channels and select according to tuner, which channels that tuner can use.

I sure wish someone would tell me about having 2 identical tuner cards in pcie slots.
What should you observe in device manager.

Installed all three tuners along with a GTX260 nvidia card.
All 3 are working fine.
Without the GTx260, I would get every few seconds glitches in the video stream. I was simply using the onboard video.
With the GTX260 and VDPAU, smooth video even with recording 2 channles and watching a third.
With only one tuner card and using onboard video no glitches, but add in a second card and it was bad experience. Simply the 2.3 ghz quad core AMD CPU and the onboard video chip could not handle multiple tuners.

Still does not explain my question about having 2 m780 tuners, what will appear in device manager.