I'll be going off to uni next year so I'm looking for a good laptop that can last me up to 4 years that is not too heavy, has a solid peformance and battery life around 7+ hours as I am staying at campus away from home . I'm currently looking at Lenovo Yoga 900, HP Spectre x360 and Dell XPS 13. The yoga and spectre has i7 6500u while the xps has i76560u. Is there a great difference between intel graphics 520 and iris 540. Can the iris compete with dedicated graphics such as AMD or Nvidia? All the laptops are said to have great battery life but there are some reviews that state otherwise so it would be great if anyone using one of these computers can give a review. I may do some gaming like dota 2 so can it be done with just intel 520 graphics?I would like around 512 GB of SSD. Does 8 and 16 ram make a big difference if I am just doing extensive browsing, multimedia and light gaming? I might take a commerce major so i do not need very good graphics card. Pricing is not a big issue as my budget is $ 1700 so fell free to suggest new laptops.