Micron’s Blazingly Fast 24 Gbps GDDR6X Memory Enters Mass Production, Coming To A Next-Gen NVIDIA GPUs Soon! - Wccftech

Just like the GeForce RTX 3090 Ti which featured all of its memory modules on the front of the PCB, the next-gen GeForce RTX 4090 would feature its 12 GDDR6X modules on the front, allowing for more cooling compared to solutions that feature memory modules on the back of the PCB such as the RTX 3090 (Non-Ti).

Although the full 24 Gbps speeds aren't expected to be utilized by the NVIDIA GeForce RTX 4090 (rumored to offer up to 21 Gbps die speeds), the 24 Gbps GDDR6X memory modules can offer up to 1.152 TB/s of bandwidth which is an increase of 14% versus the 1.008 TB/s offered on current 21 Gbps GDDR6 memory modules.