Meta has detailed its progress on its Prometheus data center campus in New Albany, Ohio, which it plans to scale to a gigawatt.

The site was originally used as a traditional Facebook data center, but the company said that it had now converted the facility into the first phase of its AI-focused supercluster.

In a blog post, Meta said that this deployment had already been used to train its Muse foundation models. It is currently home to hundreds of thousands of GPUs across multiple interconnected buildings, with traditional and AI-optimized data center buildings and rapid deployment structures all connected.

At full scale, Prometheus is planned to comprise roughly one million distributed GPUs.

The data center houses Nvidia GB200 and GB300 chips, with Vera Rubin "arriving soon."

The GB200 is supported by its Catalina rack architecture, with the company deploying "the Ariel variant, a two-rack configuration in which 36 GPUs per rack are interconnected via NVLink to form a unified 72-GPU domain," Meta's engineers said.

The Ariel variant of GB200 NVL72 pairs each Nvidia Blackwell GPU with a Grace CPU and 2x ConnectX-7 400G NICs at a 1:1 CPU-to-GPU ratio, supporting 800G of I/O per GPU.

For the GB300 deployment, Meta uses the Clemente platform. Clemente can use Meta's modular Air-Assisted Liquid Cooling (AALC) or use Facility Liquid Cooling (FLC).

"GB300 raises HBM capacity per GPU by 1.5x, from 192GB to 288GB, and dense FP4 throughput by a similar factor, while roughly doubling attention (softmax) acceleration," Meta said.

"At the platform level, scale-out is no longer the constraint it was on the GB200 NVL72: Nvidia ConnectX-8 SuperNICs deliver 800G per GPU natively, so the capability we deployed early on Ariel becomes the baseline.

At the building level, each Ethernet-based fabric interconnects up to 20,736 GPUs through a high-bandwidth, low-latency multi-layer topology. Building-level fabrics are then connected by the Backend Aggregation (BAG) network, spanning 2km to over 100km.

"It is built with Arista 7800-series chassis running deep-buffered Broadcom Jericho3 silicon, delivering multiple Pbps of bandwidth per region pair," Meta said.