Hz so good wrote:
Would it be worth it to swap out the stock twin fan cooler on a Sapphire 7950 with a 3 fan, or even a waterblock solution?
Definitely not. Sapphire's Vapor-X cooler is an excellent performer. You wouldn't get much more from an aftermarket cooler.
That money would be better saved for a future GPU upgrade (like the R9-290
that Prestige Worldwide
suggested - or waiting for significantly-upgraded GPUs to arrive with TSMC's new manufacturing process next summer).
i7-8700K, H100i v2, RoG Strix Z370-G Gaming, 16 GiB, RX Vega64, 960Pro SSD, 5TB HDD, Define Mini-C, SS-660XP2, C32HG70, RK-9000BR, MX518