So I am building an S4M system with an R9 Nano and Ryzen 5 1600. The only part i am waiting on is the HDPLEX 400 AC-DC. (Out of stock, no idea when will be available.) However Im really itching to start up my system now. I have a Dell 150w brick from an old Alienware. Assuming I am not running any intensive tasks, could this PSU connected to a HDPLEX 400w DC-ATX run this system safely?