I got this card: XFX HD 4890 8750M 1GB DUAL DVI TV Product Code: HD-489A-ZDFL It isn't working in my MacPro properly. It displays artifacts or reboots the system under BootCamp. After 15 minutes of idle warm up it works OK... I've send it to XFX for RMA and they've tested it and "NOFAULTFOUND". How it's possible ?