ECS A75F-A User Manual page 62

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3. Set the CrossFire in Advanced Menu to Enabled. Then press F4 to save the
configuration and exit the BIOS.
4. Click with your right mouse button on My Computer, then click the option
Manage and choose the Device Manager, finally, click the Display Adapters. The
following screen appears. Be sure that the External ATI graphics (ATI Radeon HD
6670) and Onboard graphics (Radeon HD 6530D or HD6550D) are both displaying
in the Display adapters.
CrossFire Technology [AMD Dual Graphics] Support
TM