Ok, so most my asm coding and knowledge of exactly what the CPU was doing ended sometime between the Z-80/68K/8086 timeframes. Are there any good books/resources on all the modern trickery that CPUs now utilize?
This will of course not be able to tell you all the black magic that is happening inside AMD's and Intel's newest designs. The software optimization manuals for these processors do include some more interesting insights, but especially the Intel ones are not the most entertaining read...