AMD tech support can lend some a processor to get around a problem, aka a “Boot Kit”. They have recently updated this procedure:
Unable to Boot New Desktop System Configured with AMD 2nd Generation Ryzen™ Desktop Processor, and AMD Socket AM4 Motherboard
Article Number: PA-100
This document provides information on how to resolve a specific boot issue that may be experienced with some 2nd Generation Ryzen Desktop Processors when installed on an AMD Socket AM4 motherboard.[…]
Graphics processing unit (GPU), although a powerful performance-booster, also has many security vulnerabilities. Due to these, the GPU can act as a safe-haven for stealthy malware and the weakest `link’ in the security `chain’. In this paper, we present a survey of techniques for analyzing and improving GPU security. We classify the works on key attributes to highlight their similarities and differences. More than informing users and researchers about GPU security techniques, this survey aims to increase their awareness about GPU security vulnerabilities and potential countermeasures.