I´ve been on a chat adventure with Gateway support, they are really funny. Obviously based in Mars or something.
Anyway, I bet our Corsairs are not defective. But they seem not to be liked by the mobo.
Let´s see what they tell you. BTW, the Taiwanese originals... I doubt you can buy them anywhere but in Taiwan and by the 1000s
Good luck and let´s keep in touch to find a solution. Great desktop but I need the 8GB. For those asking why, the Intel graphics swallow a good chunk of the 4GB.