lp231 :
Just check the Asus site to see if there are any new socket am3+ boards. They have but it's only them fm2+ boards with their current gold and black color theme that are new. Then something caught my attention and saw a another sabertooth board. It says Sabertooth 990FX/Gen 3.0 R2.0 Amd exclusive pcie 3.0. Exclusive pcie 3.0?
Doesn't socket am3+ already support 3.0? Turns no it does not. So far asus socket am3+, it's just that sabertooth gen 3.0 that has. Even their crosshair formula-z is pcie 2.0
Them fm2+ are pcie 3.0
According to this those 3.0 slots would run dual card setup at X8/X8 which equals 2.0 at X16/X16 so the real benefit was for single card use which has not been an issue.
"ASUS did the unthinkable yet simple, by innovating the first AMD platform motherboard that features PCI-Express 3.0 x16 slots, the Sabertooth 990FX/GEN3.0 R2.0. Long naming aside, the board provides you a couple of gen 3.0 slots by using PLX-made 48-lane PCI-Express Gen 3.0 bridge chip.
While the board features four PCI-Express x16 slots, only two similarly-colored slots can be used at a time, of which two are PCI-Express 2.0 x16, wired to the 990FX northbridge, and two slots being x16/NC or x8/x8-capable, being wired to a PLX 48-lane PCI-Express Gen 3.0 switch, which in turn takes two PCI-Express 2.0 x16 links from the northbridge."
Source
http://www.techpowerup.com/178545/asus-unveils-worlds-first-pci-express-3-0-motherboard-for-amd-processors.html