Hello, I have HP 250 G3 K7J62ES Notebook which has 4210U (4th generation), and I have a Lenovo Thinkpad T420 i5 which has 2520M (2nd generation). Lenovo's features is better than HP but Lenovo's proccesor is a 2nd generaiton i5 (features better) and HP 's proccesor is a 4th generation i5. Which one I should use? Which one has more performance? There are links of laptops. ((Sorry HP's site language is Turkish.)) Thank you for your responses...
You can compare both here:
If Windows 10 is your goal, use the i5-4210U. You will have far better support, especially with graphics. With the i5-2520M and Windows 10, you only have the Microsoft generic graphics driver.
While it's going to be close, considering the Turbo feature, the i5-4210U should come out on top of the i5-2520M -- and consume half the power in the process.