How to crossfire onboard video ati 4250 and ati 5570

What indicated the board and GPU are ready for crossfire?

If the mobo is crossfire ready you would need more than 1 discrete gpu...

Please read the following link regarding crossfire compatibility and requirements:

http://support.amd.com/us/kbarticles/Pages/ATICrossFire...

Hybrid ATI CrossFire™ Platform(Onboard GPU + 1 discrete GPU) Requirements:

The requirements of a ATI Hybrid CrossFire system are:
ATI Radeon™ HD 2400 Series, ATI Radeon™ HD 3400 Series or ATI Mobility Radeon™ HD 3400 Series graphics processor
ATI Radeon™ HD 2400 supports only ATI Hybrid CrossFireX™ technology and ATI SurroundView™ technology.
A motherboard based on an AMD 780G or AMD 790GX integrated chipset
Windows Vista®

If you meet all the requirements I would download GPU-Z and check if crossfire is turned on.

You can also get CCC (Catalyst control center) from AMD's website. I can turn on/off my crossfire from that location.

so..the 5570 ATI Card wont work on BIOSTAR A880G+ onboard IGP ATI 4250 for Crossfire? 
anyway..THANKS inerax