I recently remounted my nh d15 on my 8700k about a week ago and I used the noctua thermal paste that came in the box and I ran out of thermal paste from the tube applying it and it wasnt enough thermal paste and i didnt have another tube of that stuff and all i had was arctic silver 5 so i added a little bit of that and mounted the cooler

its been running perfectly for a week but it crossed my mind that I mixed thermal paste so I just though i would ask if its okay

thanks