m18 R2, running the AW3821DW while at home

I am shopping for the m18 R2 and as stated in the title will be connecting to my AW3821DW while at home. Currently I only play World of Warcraft Dragon Flight ---> War Within in August. Other than that, it; s used for normal everyday stuff like web browsing, MS Office etc. I am pretty sure this rules out the 4070 and with the 4080 being a $600 bump in price the 4090 seems exorbitant. So what do you think about the 4080 for gaming on this monitor? I am spoiled from my old desktop which when in the open world/dungeons/raids is normally 120-144fps with a drop to the 90’s in Valdrakken.