Opti announced it has filed a patent infringement lawsuit against AMD over three patents under the umbrella name of "Predictive Snooping of Cache Memory for Master-Initiated Accesses." In a release, Opti said AMD infringes the patents by making, selling, and offering for sale CPUs and core logic products based on and incorporating Predictive Snooping technology and inducing and contributing to the infringement of the patents by others.