If u did all ur home work on bios tweaking and voltage setting u should definitly be able to. Have been running one of my rigs with 6x rx580 on 1x 1000W PSU for very long time without any issues.
Ofc the heavier algos demand more power like ethash. But with all 6 cards doing well above 31 MHs the whole rig consumes 880W. But running lighter ones like some CN variants it only draws around 600W
Best thing u can do is get urself one of those plugs u can set between ur wall socket and ur miner to see actual power consumption. This helps me a lot both in controlling the amount of power drawn and ofc costs and makes finding ur aweet spot much easier.
Hope this helps a bit.