Microsoft Maia 300 tray shown with four HBM4 accelerators

A Maia 300 system shown at OCP Summit 2026 used four accelerators in a tray, each described as carrying 288GB of HBM4, according to ServeTheHome. The report identifies the system as Microsoft's Maia 300 platform. The supplied material does not include benchmark results or shipment details, so the configuration should be read as an event demonstration rather than evidence of broad deployment.