https://wccftech.com/micron-unveils-gddr6x-memory-for-nvidia-geforce-rtx-30-series/

Micron has just announced its brand new GDDR6X memory for NVIDIA's GeForce RTX 30 series graphics cards. Featured on the top models which include the GeForce RTX 3090 & the RTX 3080, Micron's GDDR6X provides much faster data transfer rates and even higher bandwidth then what was possible on the previous generation GDDR5/X and even GDDR6 memory dies.

The Micron GDDR6X memory brings a lot of new stuff to the table. It is faster, doubles the I/O data rate, and is the first to implement PAM4 multi-level signaling in memory dies. With the Geforce RTX 3090 class products, Micron's GDDR6X memory achieves a bandwidth of up to 1 TB/s which is used to power the next-generation gaming experiences at high-fidelity resolutions such as 8K.