NVIDIA tested at least three Rubin Ultra GPU variants, considering lower HBM capacity; final specifications remain undecided.

NVIDIA has reportedly tested at least three variants of its next-generation Rubin Ultra graphics processing unit. Some test versions use less high-bandwidth memory than the configuration the company originally announced.

The Information attributed consideration of lower-memory versions partly to the possibility that NVIDIA may not obtain enough advanced HBM chips to support the original design at the required supply level. The sources state that reducing memory could affect performance and that customers running large AI models could need more GPUs than under the original configuration.

Rubin Ultra’s final specifications have not been decided. NVIDIA was reported to be planning to introduce the product around the end of 2027, but the supplied reporting characterizes the memory configuration as still under evaluation.