Hi there,
I noticed some Nvidia cards come in both 2 fan and 3 fan models. Apart from the difference in length, are there any design changes that would impact on hash rate? There seems to be $200-$300 price difference between the two. If no technical difference between the two then buying twin fan model would be the cheapest.
Don't go for cheap, there is a reason for the 3 fans in this card ,it keeps the card cool and as you mentioned there is 200-300$ price difference between the two so module with 3 three fans will be more stable and will last longer then the one with 2 fans.