I recently added a MSI R9290X to my computer. I also have an XFX R9280 DD Black OC edition installed, as this was my previous GPU. I was hoping to run the two in crossfire, but there is no crossfire option in Radeon settings. I have not installed a bridge because while I see the place to install it on the 280, the 290X does not have such a place to plug it in.
Can anyone confirm these two cards are or are not able to be run in crossfire mode together? I have viewed the compatibility chart, but couldn't understand it. I read that 290X uses PCIe instead of crossfire bridge. Does this mean it won't work in crossfire with very slightly older cards that do require the bridge?
That is correct. You cannot run CrossFire with a card that uses PCIe lanes and another that uses the bridge.