![]() In August 2012 Jim Keller returned to AMD, where his primary task was to lead development of new generation of x86-64 and ARM microarchitectures called Zen and K12. These processors were used in several Apple products, including iPhone 4, 4S, iPad and iPad 2. The new team worked to design the Apple A4 and A5 system-on-a-chip mobile processors. Semi was acquired by Apple shortly afterwards, reuniting Keller with his prior team from P.A. Semi, a company specializing in low-power mobile processors. ![]() In 2004 he moved to serve as the Vice President of Engineering at P.A. In November 2000 SiByte was acquired by Broadcom, where he continued as chief architect until 2004. In 1999 he left AMD to work at SiByte to design MIPS-based processors for 1 Gbit/s network interfaces and other devices. In 1998 he moved to AMD, where he worked to launch the AMD Athlon (K7) processor and was the lead architect of the AMD K8 microarchitecture, which also included designing the x86-64 instruction set and HyperTransport interconnect, mainly used for multiprocessor communications. Prior to DEC, he had worked at Harris Corporation on microprocessor boards. Jim Keller joined DEC in 1982 and worked there until 1998, where he was involved in designing a number of processors, including the VAX 8800, the Alpha 21164 and the Alpha 21264 processors. in Electrical Engineering from Pennsylvania State University, which he earned in 1980. From 2012 to 2015 he returned to AMD to work on the AMD K12 and Zen microarchitectures. He was also the coauthor of the specifications for the x86-64 instruction set and HyperTransport interconnect. He was the lead architect of the AMD K8 microarchitecture (including the original Athlon 64) and was involved in designing the Athlon (K7) and Apple A4/ A5 processors. ![]() Keller (born 1958/1959) is an American microprocessor engineer best known for his work at AMD and Apple.
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