[bitsandboots]

I'd say the SGX is the "cheapest" only if you're trying to go beyond 96GB.

the AMD system is 96GB max for the GPU. The 128GB allocates a minimum of 32GB to the CPU.

the Nvidia system is designed to be connected to a second if so desired, making it the cheapest way to get 256GB.

If you're just going for something under 96GB, haven't seen something cheaper than the AMD system for anything that can't fit on a traditional GPU. And even then, GPUs are obscene ripoff prices lately. Here's hoping these won't be scalped too.

[ezschemi]

The 96GB is the maximum on Windows. On Linux, you can allocate 110GB.