I have a hp 280 g2 mt business pc with i7-6700k 3.4 GHz processor and 16 GB of ram (8*2) dual channel And I want to upgrade it with a gtx 1070 ti or 1070 and a psu of 550 watts should I proceed or should I upgrade it with a 1060 6 GB, I already have a 1050 ti and a 400 watt psu.