Used NVIDIA B300: Price, Listings & Specs | BreezeWish

The NVIDIA B300 is the Blackwell Ultra SXM GPU on the HGX B300 baseboard. NVIDIA's HGX reference notes list 288 GB of HBM3e per GPU and up to 8 TB/s of memory bandwidth, with eight GPUs on the baseboard. Fifth-generation NVLink is listed at 1.8 TB/s from GPU to GPU [S1]. NVIDIA announced Blackwell Ultra, including HGX B300, in March 2025 [S3].

NVIDIA's DGX B300 page lists eight Blackwell Ultra SXM GPUs, 2.1 TB of total GPU memory, and about 14 kW for the system. That page does not publish a per-GPU thermal design power [S2]. The DGX B300 user guide lists 2.1 TB on the product page as 8 × 288 GB = 2.3 TB raw [S5]. Ask the seller what the rack actually drew, and which of those two memory totals matches the serials.

A B300 for sale is usually the HGX baseboard, a DGX-class server, or modules already removed from one. Ask whether the lot includes the NVSwitch trays, the liquid-cooling hardware, and the ConnectX or SuperNIC set in NVIDIA's HGX B300 notes [S1]. A module off the board is a different offer from the eight-GPU assembly, and the price on the listing is the seller's. The B200 is the previous Blackwell GPU, with less memory on NVIDIA's HGX B200 table, and it has its own page. Sellers should put B300 in the model text, set memory to 288 when that is what they have, and say whether the cooling loop ships with the tray. Buyers comparing a loose module with a full DGX should read the user-guide feature list before they bid [S5].