Question is my mobo compatibly with gddr6

Short answer-- Yes.

Long answer -- GPU requires only A PCI E x16 Slot. To work with any system or motherboard. It doesn't matters what is your RAM type or which CPU you have...

For RAM. CPU memory controller controls Which ram you can add.

But in GPU. VRAM is already soldered to its PCB....and GPU chip already has a VRAM controller. Both controllers are independent.

It means you can use any RAM and any GPU on any Computer...