Server maker Supermicro in June agreed to lease 21MW from a Prime Data Centers facility in Vernon, California.

At the same time, the company said that it would sublicense the space and power to startup Lambda Cloud.

In an 8-K filing, previously unreported, Supermicro said that it had entered into a Master Colocation Services Agreement at the 33MW 4701 Santa Fe data center.

That ten-year deal "is estimated to be $600 million, which amount includes the monthly recurring charges, power charges, and other anticipated costs," the filing states.

That cost will be covered by Lambda through the sublicense, along with "an additional monthly charge."

This is the first time Supermicro has made such a deal, at least publicly. The company declined to comment to DCD, while CFO David Weigand dodged the question in its latest earnings call: "We consider ourselves experts in data center solutions. And so this is really just one more facet of being a total provider."

The company has, however, moved further down the data center supply chain as AI server sales boomed. In its earnings call, Supermicro announced that it would launch a data center 'building blocks solution' to help speed up data center deployments later this year.

Lambda did not respond to requests for comment.

It is not clear if, as part of the deal, Lambda agreed to buy servers from Supermicro. The company also offers its own Lambda Scalar servers - which are based on Supermicro or Gigabyte hardware.

"Lambda focuses only on GPU use cases for AI, initially for training and now going into inference," the company's head of cloud, Mitesh Agrawal, told DCD for our latest AI supplement.

Lambda is believed to be courting investors for $800m to help fuel its data center expansion. It currently operates out of colocation data centers in San Francisco, California, and Allen, Texas.