enable crossfire on IGP and PCI-E

Hi there peeps, I replaced my crap motherboard with a rather spiffy ECS motherboard based on the ATI expresss chipset. One of the funky features is the suround view mode where you can have both your pci-e video card and the onboard radeon x200 videocard active at the same time now I was wondering as I already have a pci-e Radeon x800 what would be needed to run these video devices in a crossfire configuration - driver hacking perhaps? I am also on the understanding that a mastercard is sometimes required? any input on the subject would be greatly apriciated as this is realy facinating me right now, I mean I have a system siting here that has 2 rather spiffy ati GPU's and I want to figure out if I can make use of them both. thanks peeps.

You don't say which ecs mobo... but ATI has a list here no hacking required :)