The memory range from 3GB to 4GB is assigned to memory on peripheral cards. See MMIO. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.
However, according to a rumor from the renowned leaker Golden Pig Upgrade Pack, Nvidia may equip the RTX 5090 mobile with 24Gb (or 3GB) memory modules, resulting in 24GB of total video memory.
TL;DR: NVIDIA is developing a new RTX Blackwell workstation GPU with 96GB of GDDR7 memory on a 512-bit bus, using 3GB modules. It is expected to be part of the RTX 8000 series, featuring the GB202 ...