That depends entirely on your chassis, how good is its airflow and do you mind the rest of the system's temps going up.
With the reference coolers all the air is exhausted out the back, but with open air blowers it's pushed into the chassis.
So it greatly depends on your chassis, if it's not great for airflow like lets say the H440 the reference ones and the open blowers will perform the same, but the CPU and Mobo temps might increase.
I have two reference Superclocked cards in my H440, and they're always at 83-84 degrees under 90-100% load. Not loud at all on the default fan profile and they always maintain their 1290Mhz clocks without throttling.
Personally I'm happy.