Nvidia validates Nebius HGX B300 racks for AI cloud training

Nvidia has signed off on Nebius’s production HGX B300 racks, granting the AI cloud provider its Exemplar Cloud validation for training workloads. The approval, announced on October 8, 2026, confirms that the racks Nebius runs for paying customers match Nvidia’s own reference architecture. In a market where every cloud claims to be fast, this is the chipmaker itself vouching for the setup. Nebius, which trades on NASDAQ under the ticker NBIS, paired the news with a second result. Its systems posted the fastest single-node B300 times in the closed division of MLPerf Training 6.0. What Nvidia actually checked Under the program, cloud operators run a set of standardized benchmarking recipes on their live production hardware. The results are then measured against reference targets that Nvidia defines. Nebius cleared that bar after an engineering review and an analysis of its benchmark results. The point is to show that the hardware customers actually rent performs the way Nvidia says it should. Inside the HGX B300 The hardware at the center of this is Nvidia’s HGX B300 platform. Each node packs 8 Blackwell Ultra GPUs. The platform carries approximately 2.1 TB of HBM3e memory. It also us...