I am using the HP OMEN 15-5010nr Notebook PC with this graphics card and i'm thinking of purchasing the Asus VG248QE 24-inch Full HD Ergonomic Back-lit LED Gaming Monitor and I want to use 144hz. Thanks.
You better test whether the laptop will output the 860m's display at all.
Often laptops with switchable graphics will only output the integrated gpu to an external monitor.