Vertiv and Vicor hold the leverage as AI's bottleneck shifts to rack-level power and cooling, whichever custom chip wins. Amazon CEO Andy Jassy said the bottleneck is no longer just chip availability but rack-level power delivery, thermal management and silicon efficiency, as AWS custom silicon hits a $25 billion run rate. At 100-plus kW and over 1,000 amps per rack, Vertiv's direct-to-chip liquid cooling and Vicor's vertical power delivery become critical; air cooling fails above 80-100 kW. x.comÂ

