AMD's Radeon HD 7990 graphics card reviewed
 

Well, this is quite the turn of events. We recently started using some new GPU testing tools from Nvidia that measure precisely when frames are being delivered to the display, and in the process, we found that Radeon-based multi-GPU solutions have some troubling problems. As I said in that article, our next task is to address the issue of multi-GPU microstuttering in more depth. Just as we published that article, we learned of AMD's plans to introduce a killer new multi-GPU graphics product: the Radeon HD 7990.

http://techreport.com/review/24703/a...-card-reviewed