Unless you want to run inefficient mining rigs, 1.6 kw is a WRONG maximum amount.
If you really want to step out of the amateur "hobby" mining niche you need ffficient mining rigs which need to run with a minimum of 13 GPUs per rig. The better the GPU on those rigs the higher the power consumption. For maximum efficiency you would need high powered GPUs that give the best hashrate to power consumption ratios (1080ti will do). To run those, a 1.6kw power consumption surely won't cut it.
The OP has already stated they want 4 GPUs per rig and it is certainly wrong to recommend a 13-GPU rig for a person new to mining. Between 4-8 is fine. There is no significant efficiency gain beyond that. Motherboard and CPU power usage is negligible. Software complications, heat dissipation, cable management, power supply availability, fire hazards... just too many things that can go wrong for a newbie.
how much kilowatt does my set up needs to run this mining rig?
i'm sure this will need a lot so i have to compute how much will it consume and is it worth the time. i'm just going to altcoins though. the set up would be just 2 computer with about 4 GPU on each. i wouldn't consider the aircondition for now just the 2 computer and 4 GPU each.
You'd need up to 2 kW but it's impossible to tell without knowing which GPUs you want to use. 8x 1060s would probably fit into 1.2 kW.