Many users claim the Security Update for Windows KB4056892, the Microsoft Meltdown/Spectre patch, bricks AMD Athlon-powered machines. Intel confirmed that extensive testing conducted by tech giants (Apple, Amazon, Google, and Microsoft) to assess any impact on system performance from security updates did not reveal negative effects. AMD CPUs are not susceptible to the Meltdown attack, but are vulnerable only to Spectre attacks. Some users reported that even re-installing Windows 10 doesnt solve the problem.”]
Source: http://securityaffairs.co/wordpress/67498/hacking/microsoft-kb4056892-bricks-athlon-pcs.html