Question: Jim Keller is a microprocessor engineer most well known for his work at AMD and Apple, he was involved in designing which 32-bit package on package (PoP) system-on-a-chip (SoC) designed by Apple Inc. and manufactured by Samsung? 
Sentence (from "Jim Keller (engineer)"): He was also the coauthor of the specifications for the x86-64 instruction set and HyperTransport interconnect.
Relevant evidence: No