APIC and IRQs below 16

I'm not very familiar with APIC nor IRQ stuff, but according to the readmes of the PCI card manufacturers in my box, it's not such a good idea to share interrupts on any of the following:
- wctdm (Zaptel)
- bt878 (DVB-S)
- saa7133 (DVB-T)

According to the IRQ table, the PCI-E graphics card and the Zaptel card are both on IRQ16:

Code:

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          CPU0      CPU1     
  0:      6217    273641  IO-APIC-edge      timer
  1:          0        10  IO-APIC-edge      i8042
  6:          0          3  IO-APIC-edge      floppy
  7:          0          0  IO-APIC-edge      parport0
  8:          0          1  IO-APIC-edge      rtc
  9:          0          0  IO-APIC-fasteoi  acpi
 12:          0          4  IO-APIC-edge      i8042
 14:          0        49  IO-APIC-edge      ide0
 16:      12812    1146464  IO-APIC-fasteoi  wctdm, nvidia
 17:      17306    750841  IO-APIC-fasteoi  bttv0, bt878
 18:      2431      84523  IO-APIC-fasteoi  saa7133[0], saa7133[0]
 19:          0          3  IO-APIC-fasteoi  ohci1394
 20:          0          0  IO-APIC-fasteoi  sata_nv
 21:        16        942  IO-APIC-fasteoi  sata_nv, HDA Intel
 22:      5556    254420  IO-APIC-fasteoi  sata_nv, ohci_hcd:usb2
 23:      3149    112234  IO-APIC-fasteoi  ehci_hcd:usb1, eth0
NMI:        99        116
LOC:    279801    279782
ERR:          0

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Is it possible to use IRQs below 16 (such as 10 or 11) for PCI cards as well, in other words get either wctdm or nvidia to move to a lower IRQ?

Many thanks for your help, -sven