Thanks everyone for helping me out...
I just end up buying a AMD Rx Vega 56 for $621.. they only had a one piece in-stock soo I think I made a good decision
It only has a single fan.. 😐is it really enough to cool down this GPU ??
Well you will find that soon enough

It depends mostly from your air flow in your pc case and how much undervolting you apply to it and also what algo will you mind with it,with cryptonight you should be safe in any case