NVL576
NVIDIA's announced Rubin Ultra system of eight MGX NVL72-class racks in one 576-GPU optical NVLink domain. At GTC 2025 the same name meant one Kyber rack counted by dies; that rack is now NVL144.
Current numbers
~600 kWRubin Ultra Kyber rack (NVL144, 144 packages) on 800 VDC; NVL576 links eight 72-GPU racks