That flow-through cooling looks like it would be really good though. I might go for the FE cards this time around.
Any temps below 80C at load are perfectly safe and shouldn't result in throttling -- the same is true for CPUs. If you aim for lower temps than 80C, you aren't going to get better performance, although lower temps are a good way to get your computer to run more quietly.
You're not directly going to get better performance, but you can run higher clocks for longer before throttling, leading to higher performance.