H2O cooling introduces an unnecessary water leak liability that is real and can damaged expensive PC hardware. The closed loop coolers can, do and have leaked so it's not a matter of if, it's a matter of when. If you're happy with a water leak liability then go for a CLC other wise there are numerous quality HSFs that will provide excellent cooling and never leak water to damage your PC.
The top five AMD HSFs at the link below can all provide excellent cooling for a FX-9590. Scroll down to the AMD section because CPU coolers perform differently on AMD vs. Intel CPUs based on the heat spreader size. Most of the CLC fanbois are oblivious to this fact.
The Corsair forums give a good reality check to those who are in denial about the high failure rates on Corsair CLCs and the PC damage that can occur. The H2O fanbois ignore reality and pretend leaks don't happen but they do. When they can't refute the low cooling performance of the CLCs and the water leak liability, then they attack the messenger in an effort to distract from the liabilities of H2O cooling. CLCs are a fad just as pet rocks were. They aren't needed and in most cases they don't even perform as well as a HSF.
Even with a 5 year warranty CLCs can and still do leak and damage PC hardware. They can cause a loss of important data and even potentially a house fire. The warranty doesn't prevent any of this nor the loss of use of your PC for weeks and the need to ship damaged PC hardware back and forth when the damage occurs. And people endure this nonsense for what purpose, just so that they can claim they are using H2O cooling? It's a pretty irrational decision when a HSF provides equal or better performance than all but the top CLCs and HSFs never leak water. Some people are easily deceived by marketing hype.
I recommend that people technically educate themselves instead of being duped by marketing hype and fanboism. Then buy whatever makes you happy.
Attacking the messenger doesn't change reality.
Technical ignorance is NOT a destiny it is a choice. Do your homework so that you can make technically informed decisions and not be duped by advertising hype or mis-information stated as fact when its not.