Speeds can’t increase forever though because physics. I was under the impression 5ghz was near the theoretical limit, so I don’t believe we’ll see 7ghz any time soon.

First time hearing about it. Link for others who are also wondering what Microsoft Pluton is:

https://www.microsoft.com/en-us/security/blog/2020/11/17/meet-the-microsoft-pluton-processor-the-security-chip-designed-for-the-future-of-windows-pcs/