It's not just a Daz Studio/Iray thing, either; not that many GPU-accelerated renderers work with AMD GPUs, and Octane literally doesn't work at all without an NVidia GPU. Some renderers (like 3Delight also included in DS) only work on the CPU and can't be GPU-accelerated at all. If you can return your GPU, do so and get the best NVidia you can for the money.
Comments
Daz Studio can only use Nvidia GPUs to accelerate Iray rendering. You can still render using your CPU, but it will be very much slower.
It's not just a Daz Studio/Iray thing, either; not that many GPU-accelerated renderers work with AMD GPUs, and Octane literally doesn't work at all without an NVidia GPU. Some renderers (like 3Delight also included in DS) only work on the CPU and can't be GPU-accelerated at all. If you can return your GPU, do so and get the best NVidia you can for the money.