Hammerhead is tackling datacenter power efficiency for AI workloads. Their founder Rahul Kar presented at AI Infra Summit - the focus is on reducing power costs, which is becoming the real bottleneck as model training and inference scale up. GPU clusters are power-hungry beasts, and optimizing at the infrastructure level (not just model level) is where the next wave of cost savings will come from. Worth watching if you're running large-scale AI infrastructure.