Pentium Evolution (2) 80486 ◦ Sophisticated powerful cache and instruction pipelining ◦ Built in maths co-processor Pentium ◦ Superscalar ◦ Multiple instructions executed in parallel Pentium Pro ◦ Increased superscalar organization ◦ Aggressive register renaming ◦ Branch prediction ◦ Data flow analysis ◦ Speculative execution