The fact that "2TB is addressable" is irrelevant. Putting NAND on the board doesn't improve latency/bandwidth nearly enough to function like vram. Nvidia has also supported unified virtual memory since Pascal, meaning you can address your cpu's ram in GPU code. The "SSG" card still has the 2tb of flash on a PCIe interface, so not much difference from existing systems beyond marketing. I'd expect very few real world perf wins.