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Both the the 1300w and 850w. The motherboard actually supports integration with 3 PSU's. I am only using 2 now. If I expand, then I will need to add a third.

where are you from? how cheap is electricity there.. I only have 3asus 1070 gpus.. I want to get my hands on that motherboard which you have

Norther California. Power is not cheap here! Around .13/KwH Considering adding solar eventually if I keep with this hobby.