❶ A modified NVIDIA RTX 5090 GPU with 128GB GDDR7X VRAM emerges in China's underground market, priced at $13,200 for AI workloads.

❷ Custom PCB design and prototype memory chips enable the VRAM upgrade, requiring dual-sided configurations and custom firmware to function.

❸ Concerns arise about fraudulent resale of stripped GPU cores and the technical viability of high-density memory mods amid the AI hardware boom.