The Pentium Pro
Introduced in the year 1995, the Pentium Pro reflected still more design breakthroughs. The Pentium Pro may process 3 instructions in a single clock cycle- 1 more than the Pentium. In addition, the Pentium Pro may gain faster clock speeds-the earliest model available was packaged with a 133 MHz clock. Intel coined the phrase "dynamic execution" to explain the specific innovation that distinguishes the Pentium Pro. Dynamic execution refers to the ability of chip to execute program instructions in the most efficient manner, not necessarily in the order in which they were written. This out-of-order execution means that instructions that can't be executed instantaneously are put aside, while the Pentium Pro start processing other instructions. In contrast this is to the original Pentium chip that may stall because it executes instructions in strict sequence.