B580 lag

HI guys,

i just purchase an intel arc B580 (challenger asrock)

it lag in games and youtube when im in the resolution of my screen : 2560 * 1440

when there is lags my cpu gpu ram performance are normal

when im in 1920* 1080 , games and youtube is smooth

youtube should not be lagging because you can run youtube without graphic card

any ideas how to fix it ?

thanks