in my case, yes! no way to "clock" both card (vgpu) with cat 9.7/9.8!
But there is another condition: i have to use an asus mb (maximus 2gene) because it does not work with my DFI JR P45...

on max 2 gene + cat 9.5 : i only have to apply the vgpu w/smartdoctor once for all to raise both vgpu!!!