I had nvidia gtx 690 and nvidia gtx 760. They were both seen by the driver 340.52 and there was checkmark "use multiple GPU devices". Adobe AE CC 2014 when rendering was recognizing and using both GPU devices. Then I replaced the gtx 690 with gtx 780Ti as a primary device. The driver does not show the option allowing to use multiple gpu devices and in the preferences of AE Only the 780 ti is shown. When rendering only this graphic card works. My question is how to employ both GPU's 760 & 780 ti into rendering as it was the case with gtx 760 & 690?
Many thanks for your help.