can i ask what happen to the mobo sending to rma?

and can xfx support other brand of gc like galaxy gtx260..

also if wanna buy diff brand of gc to sli can it be functioning well, or need only xfx gc to run with the mobo.

i am kinda afraid that if i buy it is not compatible with other brands of gc because some xfx only can have identical support and must use xfx gc only... thank you..