Supermicro SYS-822GS-NB3RT specs: the 8U air-cooled server on NVIDIA HGX B300

What the Supermicro SYS-822GS-NB3RT is

The Supermicro SYS-822GS-NB3RT is an 8U air-cooled server built on NVIDIA HGX B300, with eight Blackwell Ultra GPUs, listed by Supermicro at 288 GB each and linked by NVLink, two Intel Xeon 6700-series P-core processors and 32 DIMM slots for up to 8 TB of DDR5. Supermicro's product page, read 12 November 2026, lists six 6,600 W power supplies in a 3+3 layout, a depth of 950 mm and a net weight of 119 kg. Supermicro publishes no system power figure for this model.

The model name is exact. Supermicro lists the system as "Supermicro Gold Series SYS-822GS-NB3RT" and describes it as "DP Intel® air cooled GPU server with NVIDIA HGX™ B300 8-GPU (onsite service required)". One character decides the generation: the SYS-822GS-NBRT, without the "3", is Supermicro's 8U system on HGX B200 with 180 GB per GPU.

We supply Supermicro servers per project. HGX B300 systems come through distribution, which asks for the company, the project and the intended use before a quote; send us these three together with the site and we reply within one business day.

SYS-822GS-NB3RT specifications from Supermicro's product page

Supermicro's product page and datasheet page for the SYS-822GS-NB3RT (©2026, no revision date) and manual MNL-2867 (last published 8 January 2026), read 12 November 2026.

For management Supermicro lists SuperCloud Composer, Supermicro Server Manager, Super Diagnostics Offline, the Thin-Agent Service and the SuperServer Automation Assistant. The product page does not name the management controller; the quick reference guide (MNL-2867-QRG) shows an IPMI port.

The HGX B300 board, GPU memory and NVLink

NVIDIA's HGX page, dated 30 September 2026, describes the platform as "available in a single baseboard with eight NVIDIA Rubin, NVIDIA Blackwell, or NVIDIA Blackwell Ultra SXMs". Its HGX B300 column lists eight Blackwell Ultra SXM modules, fifth-generation NVLink with 1.8 TB/s from GPU to GPU and 14.4 TB/s in total, and 1.6 TB/s of networking bandwidth. FP4 Tensor Core throughput is given as 144 PFLOPS sparse and 108 PFLOPS dense. FP64 is listed at 10 TFLOPS for the whole board, a figure to check first for codes that depend on double precision.

GPU memory appears in two versions. Supermicro's product page lists the board as "HGX B300 8-GPU (288GB)" and gives "2.3TB of HBM3e GPU memory per system" among its key features, which is eight times 288 GB. NVIDIA's HGX page prints 2.1 TB of total memory for the same eight GPUs, and so does Supermicro's own press release of 9 December 2025; NVIDIA's user guide for the DGX B300, in turn, prints "8 x 288 GB = 2.3 TB total". We plan with the 2.1 TB of NVIDIA's HGX page, about 270 GB per GPU. Reading 270 GB as 270 billion bytes, our sizing rule (0.9 times the memory, less 3 GiB per GPU) leaves 223.3 GiB per GPU and about 1,786 GiB per system for weights and KV cache; the driver on the delivered system decides. The B300 MIG profiles are in our article on DGX B300 specs and power requirements.

The HGX column names neither a processor nor system memory. A footnote on the same NVIDIA page reads "CPU and memory specs are defined by OEM offerings".

Processors, memory and drives

The board has two LGA-4710 sockets for Intel Xeon 6700-series processors with P-cores, each with up to 86 cores, 172 threads and 350 W of TDP under air cooling. The manual MNL-2867 names the 6700 and the 6500 series.

All 32 DIMM slots take DDR5 ECC RDIMM. With one module per channel, sixteen modules in all, the product page gives up to 4 TB at 6400 MT/s. With two modules per channel the maximum is 8 TB, and here Supermicro's documents differ on the speed: the specification table prints 6000 MT/s, the key features and the manual 5200 MT/s. Have the quote state the module count and the speed it was planned with.

Storage consists of eight front hot-swap E1.S NVMe bays and two M.2 NVMe slots, the latter with RAID support through an S3808N controller. Two PCIe 5.0 x16 slots, full height and half length, remain for adapters.

Supermicro also lists two pre-configured versions, SYS-822GS-NB3RT-01-G2 and -02-G2, as "Gold Series version with pre-configured components". The datasheet page of the -01-G2 names two Intel Xeon 6768P processors with 64 cores at 2.4 GHz, 2 TB of DDR5-6400, one 960 GB M.2 NVMe drive and a network option of eight 800G InfiniBand ports or sixteen 400GbE ports. We did not read the contents of the -02-G2.

Network ports for the cluster and for storage

The cluster network is listed as "8 OSFP 800 GbE LAN ports (NVIDIA ConnectX®-8 SuperNIC™)", and two RJ45 ports at 10 GbE on an Intel X710 serve as on-board LAN. For traffic to storage and to the rest of the network, the key features on the datasheet page speak of up to two NICs for north-south traffic, and Supermicro's brochure "NVIDIA Blackwell Solutions" of December 2025 names two dual-port NVIDIA BlueField-3 DPUs. The two PCIe 5.0 x16 slots are the free slots on the product page, but Supermicro does not say in one sentence that the DPUs sit there, so have the slot assignment confirmed with the configuration.

Confirm the side of the ports as well before the cabling is planned: the brochure speaks of front I/O for NICs, DPUs, storage and management, while the quick reference guide lists the same ports under a rear heading.

What these adapters do is covered in our articles on the ConnectX-8 SuperNIC in an AI server and on when a GPU server needs a BlueField-3 DPU.

Power supplies and input voltage

Six power supplies of 6,600 W each are fitted as 3+3: three are enough to run the server and three are redundant. Supermicro rates them "Titanium Level (96%)". The nominal 6,600 W is reached only at the top of the voltage range.

Supermicro's product page for the SYS-822GS-NB3RT, read 12 November 2026; every range at 50 to 60 Hz.

On a 230 V supply each unit delivers 6,500 W, and three of them 19.5 kW by our arithmetic. That figure is supply capacity. Supermicro publishes neither a system power figure nor a heat output on the pages we read. The 14.5 kW in NVIDIA's user guide is the power consumption of NVIDIA's own DGX B300 and is not a Supermicro figure. Supermicro's Blackwell overview page says the 8U system "maximizes performance of eight 1100W HGX B300 GPUs"; eight times 1,100 W is 8.8 kW for the GPU modules alone by our multiplication, with processors, memory, network adapters, fans and conversion losses on top. No range of 100 to 127 V is listed, so the system needs a 200 to 240 V feed.

The feed side is documented only in part. The product page names neither the inlet nor the cord type. The 80 PLUS report for the supply, model PWS-6K61G-2R, tested on 27 January 2025 at 230 V, gives a rated output of 6,500 W, an efficiency of 96.27 per cent at half load and 95.33 per cent at full load, and a rated input current printed as "16-15 x 2". We read that as two AC inputs of up to 16 A per supply, which would mean twelve 16 A connections for six supplies; 6,500 W at 230 V and about 95 per cent efficiency is roughly 30 A, which fits two such inputs and exceeds one. This is our reading of the report, not a statement by Supermicro, so have Supermicro confirm the number of outlets and the connector before the rack is planned. How 3+3 and other layouts map onto A and B feeds is explained in our article on PSU redundancy in GPU servers.

We check the rack, power and airflow before we quote; tell us the voltage, the feeds and the outlets at the rack position and the configuration is planned around them.

Depth, weight and cooling at the site

The chassis is 356 mm high, 449 mm wide and 950 mm deep. That is 45.8 mm more than the 904.2 mm of NVIDIA's DGX B300, so a rack measured for the DGX is not automatically deep enough. Supermicro's own rack for four of these systems, the SRS-48UAC-8U4N-R0 in its datasheet "NVIDIA Blackwell Architecture Solutions" (©2025), is 48U high, 750 mm wide and 1,400 mm deep and holds 32 GPUs.

Net weight is 119 kg and gross weight 137 kg, in a package of 670 × 730 × 1,280 mm. The AMD model of the same chassis carries identical figures, so in our reading they describe the chassis; ask for the weight of the configured system before the floor and the lift are planned. The manual's chapter on rack installation gives no weight limit and no rail depth. It stays general: "Depending on the size of the system, you might need to use a lift" and "Always install servers to the bottom of a rack first".

Up to twelve heavy-duty fans cool the system, and the operating range is 10 °C to 35 °C at 8 to 80 per cent relative humidity, non-condensing. The words "(onsite service required)" belong to Supermicro's description of the model; the pages we read do not explain what the buyer has to order for it. Our article on on-site service for GPU servers collects what the makers state.

Rack depth, floor load, the way in from the loading bay and the feeds belong in a survey before the order. Our site survey for GPU servers lists what to measure, and 4U vs 8U GPU servers sets this class next to eight-card PCIe servers.

SYS-822GS-NB3RT and NVIDIA DGX B300 side by side

NVIDIA's product pages print the same GPU figures for the HGX B300 board and for the DGX B300. The systems around the GPUs differ.

Supermicro's product page for the SYS-822GS-NB3RT and Supermicro's Limited Warranty page (undated), read 12 November 2026; NVIDIA's DGX B300 product page (15 October 2026) and DGX B300 user guide, chapter "Introduction to NVIDIA DGX B300 System", read 12 November 2026.

The two weights are not on one basis: NVIDIA states a system weight for each version, Supermicro a net and a gross figure that its AMD model shares. The DGX B300's product page lists NVIDIA AI Enterprise and Mission Control as recommended. Supermicro's Limited Warranty page lists three years of labour, one year of parts and one year of advance cross-ship for GPU systems.

The power layouts differ too. The DGX B300 has twelve supplies, each with its own C19/C20 cord and up to 16 A per outlet; next to "12 x 3.2 kW" the same user guide page prints 3.3 kW at 200 to 240 V for each supply. The Supermicro server has six larger ones. For the DGX B300, NVIDIA's user guide requires installation by NVIDIA partner network personnel or NVIDIA field service engineers.

Our comparison DGX B300 vs DGX B200 vs HGX B300 covers the GPU generations, and eight H200 NVL in one server or a DGX B300 shows when a PCIe server is enough.

Supermicro's other HGX B300 models

Supermicro's brochure "NVIDIA Blackwell Solutions" (December 2025) and the six product pages, read 12 November 2026.

The AMD model, which Supermicro writes "AS -8126GS-NB3RT" with a space, shares the chassis, the six supplies, the dimensions and the weights. It takes two AMD EPYC 9005/9004 series processors of up to 500 W and has 24 DIMM slots for up to 6 TB. Its description carries no onsite-service note, and its page adds "Power supply full redundancy based on configuration and application load".

The four liquid-cooled models all carry the words "complete rack and onsite service are required", and the page of the SYS-422GS-NB3RT-ALC adds "Complete liquid-cooled rack integration is required for purchase". We give no depth for the 4U models: all three pages print 39.03 in, with 896.8 mm on the two -LCC pages and 991.4 mm on the -ALC page, and 39.03 in converts to 991.4 mm.

How a Supermicro HGX B300 server is ordered in the EU

We supply HGX B300 servers per project, on one EU contract and invoice. Before we can quote, the distribution asks for the company, the project and the intended use. For the configuration we also need the site: the rack, the feeds with their voltage, the supply-air temperature and the way in from the loading bay.

We publish no prices. The quote depends on the processors, the memory, the drives, the network adapters and cables, the service level and the approval of the project, and it reaches you in writing. NVIDIA AI Enterprise licences come on the same invoice. To start, write to us with the project, the intended use and the site, or send the same details to request@eurokommerz.at.

The steps of a project order are described for the DGX B300 in our guide to buying a DGX B300 in the EU.

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