NVidia has been talking about 800VDC 1MW racks for about a year now.[1] They're trying to get others to solve the power and cooling problems. The Schneider Electric view: [2] The view from Flex.[3]

This was being talked about more in 2025 than it is now. Nobody seems to have deployed a 1MW rack yet. There are major problems to be solved for that level of power density. The fire protection people want racks in fireproof enclosures with a built in inert gas extinguishing system and smoke detectors that pull in air from many points for very fast detection. The cooling people talk about 400 gallons per minute of chilled glycol. The power people talk about arc flash protection and worker safety.

This is a scary level of energy density. Not hopeless; the switchgear and semiconductor inside locomotives are at comparable levels.

[1] https://developer.nvidia.com/blog/nvidia-800-v-hvdc-architec...

[2] https://blog.se.com/datacenter/2025/10/16/the-1-mw-ai-it-rac...

[3] https://flex.com/resources/megawatt-racks-are-coming-how-800...