Hey there. I saw you made a post about the new Radeon 6870 series graphics card being used with your iMac. I'm looking to build a gaming PC and want to use my 27" iMac as the monitor. Will I run into any problems with using a single Radeon 6870 in my new pc? What kind of cable do I need and what would I press to make my iMac recognize that it's being used as just a monitor? Or does it automatically do that? Thanks for your time.