I have the MSI Trident3 with a i7-7700 since 2,5 month. I ask the german MSI support about the PSU if I wane Upgrade to a 1070 and the told me I just need to buy this http://citosoft.com/prshop16/en/netzteile/168-netzteil-fuer-msi-gt80-ms-1812-330w.html?search_query=330&results=1
I I'm good to go.