I have a Dell Optiplex 780 and want to transfer recordings from my Canon Optura 50 camcorder to my computer. I have a video cable that fits the camcorder but no firewire port on the Dell 780. I purchased the 2+1 FireWire 800/400 PCle Combo Host Card from Vantec but it would not fit into the open expansion slots on my Dell 780.There are two open slots.

The video cable from the camcorder fit into the firewire 400 Port (6-Pin). 

Where can I find a firewire card with 400 port 6-Pin?

Thanks