"To be clear, the security research team identified three variants targeting speculative execution. The threat and the response to the three variants differ by microprocessor company, and AMD is not susceptible to all three variants. Due to differences in AMD's architecture, we believe there is a near zero risk to AMD processors at this time."
https://www.cnbc.com/amp/2018/01/03/amd-rebukes-intel-says-flaw-poses-near-zero-risk-to-its-chips.html?__twitter_impression=true