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).
i7-6700K, NT06-Pro, GA-Z170N-Gaming5, 32 GiB, 980Ti, SM951, 5TB HDD, Blu-ray, FTZ01, SX600-G, 3007WFP+2001FP, RK-9000BR, MX518