Nvidia Rubin Platform BOM Sees PCB Values Surge 233%, Dethroning GPU as Fastest-Growing Component (NVDA)

Nvidia’s next-generation Rubin AI super-rack, priced at $7.8 million per rack, has delivered an unexpected bill-of-materials shift: printed circuit boards (PCB) now show the steepest value growth, not GPUs or HBM memory, according to a Morgan Stanley teardown published May 2026. Per-rack PCB content leaped 233% to $116,700, up from $35,100 in the predecessor GB300 platform, while GPU’s share of total BOM fell to 51% from 65%. The redesign is driven by a cable-less architecture: high-speed midplane PCBs replace copper interconnects, requiring up to 44-layer boards with M8 and M9 ultra-low-loss materials as signal rates push toward 224Gbps. The upgrade adds roughly $46,400 in new PCB value from connect modules and midplanes alone. The report calls out aggressive capacity build-up by Chinese manufacturers, with top-tier investments exceeding 400 billion yuan ($55 billion) through 2026, raising concerns of a supply glut by 2028. Longer-term risks include a technology shift to silicon photonics and material bottlenecks in advanced laminates and ultra-fine glass fabrics.