ok I have giga..z390 extreme wf motherboard. i9900k. I have 16g of dd4 4100.. I have giga..extreme wf 2080 8g over clockable.. I have a m.2 . I have a 12v water pump.. I want to get all core to 5ghz.. I've never overclocked before so have no idea how much power I need. I don't want sli.. is 850power over kill. how does power work? will I always be consuming 850 power or is it on demand power. like if I only use 500w it will only consume 500w? thanks.. sorry im a noob but ill get there..