AMD ATI Radeon HD 4600 Series User Manual page 20

14 ATI CrossFireX Technology
3.
Select the Enable CrossFire™ check box.
4.
If your system has more than two ATI CrossFireX-capable graphics cards,
the dialog appears where you must select the graphics card that will partner
with the Master GPU.
Note: Enabling ATI CrossFireX for the selected graphics card automatically
disables GPU Accelerated Physics for that same card.
ATI Radeon HD 4600 Series © 2008 Advanced Micro Devices, Inc.