The amount of fans is really not the only thing you should be looking for on a GPU if you want to factor in noise, price and power/etc. You should also look how hefty the heatsink is, along with number of heatpipes, maybe there is a backplate heatsink? The more of/better those components are factor into how hard the fan(s) may work, thus changing the factors you are asking about.
ig. Crappy heatsink = heat isn't dissipated from GPU well, fans must work harder to bring in cold air/blow hot air hot resulting in more fans needing to spin more = taking up more power (although pretty insignificant value compared to what the whole board consumes, lol) and that results in more noise. It's all connected.
Also you need to be able to distinguish if the fans operate in blow heat outside case config, or take cold air in case and recycle into warmer air.