I recommend either the Asrock 990FX Fatality Pro if you can still find one or the Asrock Extreme9. Both of these Asrock mobos have a proper 12+2 phase VRM circuit to deliver sufficient power for 8-core FX CPUs and both are approved for the FX-9000 series models. IME both are better quality mobos than Asus or Gigabyte mobos and the Asrock usually cost less. IME, Asrock customer support is lightyears ahead of Asus and Gigabyte in my 20 years experience building many highend PCs.
Asus mobos are pretty over hyped IME. Independent testing shows that the Asrock mobos OC as well or better than the Asus and Gigabyte mobos. The only two mobos that I have had fail in 20 years of building highend PCs were both Asus. Asus tried to replace a 2 month old mobo with a POS refurbished mobo that someone had hand solder repaired. It was covered with dirt and looked like they found it on the side of the road. Asus also uses multiple companies to produce their mobos so you never really know what you'll end up with. You can read about customer support for the various mobo companies and it ain't pretty.
Even though I like the Gigabyte Ultra Durable series mobos, Gigabyte denied for two years that their AM3+ mobos had any issues with the VRM circuits and 8-core CPUs despite me proving to Gigabyte in their own mobo testing, the VRM issue. Now two years later they come out with a new Rev. (FXA) and a redesigned VRM circuit that can properly handle the 125w, 8-core FX CPUs. I'm not sure I'd trust Gigabyte again, especially with a FX-9000 series CPU that has a 220w TDP.
Make sure that whatever mobo you buy fully supports your FX-9590 and that it has whatever features you may need.
Building a reliable PC involves more than just assembling the parts. You need to be able to configure all of the BIOS settings appropriately. This can be quite involved and frustrating as it can require a lot of trial and error with stress testing. It is however often the only means to get a 100% reliable PC.
12:45 PM by