So, last weekend i was playing games with 60 frames per second with my 90W charger on dell latitude E6440, but i by mistake broke the 90W charger so i have tryied my old 65W charger for the same notebook E6440 but i was getting like 25 frames per second with it so i have bought 90W yenkee charger for around 28-29 dolars i think but games was still running around 30 frames per second. The charger is this one: YENKEE univerzální napájecí adaptér YAU 90112, 90W | CZC.cz, it is in my language, i'm sorry but it is something like multi adapter. The notebook is Dell latitude E6440 with AMD radeon 8600M series graphics.