Nvidia is reportedly testing variations of its upcoming Rubin Ultra accelerator with less memory due to concerns it won't be able to source enough HBM. The report confirms an earlier comment from firm SemiAnalysis about a potential Rubin Ultra memory downgrade. According to The Information, Nvidia is testing versions of Rubin Ultra with 192 GB or 256 GB of memory, as well as versions that use fewer than the 16 announced memory stacks. Although Nvidia has yet to comment, reports at the time suggested Nvidia would move ahead with a dual-GPU Rubin Ultra. Even with a dual-die Rubin Ultra, the quoted capacities are lower than expected.