Currently each card has 2 x SDI inputs, so a maximum of 3 cards can be put in to an Intel MacPro, giving 6 x SD-SDI inputs. We are still testing, but it looks ok.
The same cards supports 1 x HD-SDI input - Testing is still underway - BUT it should be possible to have 3 x HD-SDI, eventually, subject to hardware. Watch this space.....
Cards should be available shortly - do contact me for pricing
Simon