Hi, i am seeing a few people upgrading their t420 with an i5-2520m processor to the i7-2670qm. i'm interested in upgrading mine too. however, since my t420 is carrying an i5-2540m i am struggeling to find out if sticking in an i7-2670qm will be worth it performance-wise (money is not the issue).. This shows that you can upgrade the cpu with no problems and the temperatures are pretty good even better then i5-2520m. cheap video games at: https://www.g2.... I updated my t420 with a 2720qm. the quad core gets pretty hot when running intensive programs for a long time. i've seen temperature readings reach 99c. i don't know if the cpu is throttling at this point. so yes, the upgrade will work, but heat and battery life will be an issue..
The battery should be removed before working on the laptop like this! this is still a decent laptop in 2017. new windows 10 free update method: https://www.y.... Crucial memory and ssd upgrades - 100% compatibility guaranteed for lenovo thinkpad l420 - free us delivery.. Lenovo thinkpad l420 785638u intel core i3-2310m (2.10ghz, 3mb l3) cpu type 2nd gen core i5 corel burn.now lenovo edition, corel dvd moviefactory lenovo edition, corel windvd, norton.