Question: what is the difference between 3rd generation laptops and 4th generation laptops?
Answer: Slightly better CPU. Assuming the same clockspeed (like 2.1GHz) and number of CPU cores (dual / quad), Haswell CPUs are 6% more powerful. 3. More powerful integrated graphics core (iGPU) which means better performance in games, but still relatively poor performance compared to a dedicated laptop for games.