https://wccftech.com/nvidia-geforce-rtx-30-ampere-graphics-cards-microns-gddr6x-rtx-3090-confirmed/

A render of NVIDIA's upcoming GeForce RTX 30 series Ampere gaming graphics cards in its reference Founders Edition design. (Image via Reddit User u/dertpert88)

Micron has seemingly confirmed in a blog post that they are indeed preparing the next-generation GDDR6X memory which would be featured on NVIDIA's Ampere based GeForce RTX 30 series cards including the flagship RTX 3090. The next-generation GDDR6X memory interface will deliver higher bandwidth and improved performance efficiency compared to the existing GDDR6 memory that is incorporated by the GeForce RTX 20 'Turing' and Radeon RX 5000 'RDNA' graphics cards.