Haswell-U series processors were the ultimate generation for Ultrabooks. The goal was to have an SoC with usable integrated graphics in a 15W TDP and it delivered. It delivered great battery life through the new power control architecture, fast video conversion and optimisation hardware and ‘always-on’ through the Microsoft InstantGo feature on Windows 8. The next generation of that CPU, based on much the same architecture as the Haswell-U generation, is just about to reach the market and in just a few days we’re expecting the first real hands-on with products and prototypes based on Broadwell-U. But just how much better is it going to be? A recent test of a new HP envy 15 with the Core i7-5500U processor gives us some clues.