Once I received the extension replacement. Things look really good initially. (motherboard Asus x99 pro) But I do a lot more tests in the coming days. I thank the ThermalTake for good support.
Sorry guys the extender has Exactly the same problem so probably not damaged and the second but is incompatible.
My Pc once time boot normally,other time not at all,and some time with delays in graphics.. (on PCI 1 x16)
I'll wait for updating the solution you provide.