"graphics memory" is probably not the right term here. While the Pro SSG does have 2TB of storage on board, that comes in the form of a NAND flash, PCIe SSD (from Samsung IIRC). While fast, this SSD provides single digit GB/s bandwidth at most, compared to the hundreds of GB/s of bandwidth that the DRAM-based GDDR5 or HBM provide. When we say "graphics memory," we're almost always referring to the latter, and never see more than maybe 32 GB of DRAM based memory on board.