The demo used a next-generation build of SQL Server, code-named "Kilimanjaro ... during the keynote was the scale up to 256 logical processors. However, 256 apparently is not the limit.

Microsoft has confirmed several bugs causing install and Blue Screen of Death (BSOD) issues impacting Windows Server 2025 systems with more than 256 logical processors. Users may experience ...

"Servers which have a high number of logical processors might experience issues running Windows Server 2025. This is presently observed on servers which have more than 256 logical processors," the ...