Past the Patterson/Hennessy books, Shen/Lipasti's "Modern Processor Design" was really helpful to get a better sense of the implementation details of real chips

Past the Patterson/Hennessy books, Shen/Lipasti's "Modern Processor Design" was really helpful to get a better sense of the implementation details of real chips, especially when you move past the 'conceptual' views (e.g. Tomasulo) and start to ask how instruction schedulers or renaming or load/store buffers actually work.