500w just for a sli. Plus cpu 85w. Technically speaking yes it should be enough. But that does not include your fans, mobo, hdd or aio cooler yet. If everything add in might hit your peak.
So on the safer side best is go for 850w. If you want slightly cheaper can pm me also.
A true power 500w that can maintain it 90% of the time is adequate for most atas setups. Usually the power requirement listed on the GPU side is more towards the safe side.
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