Long story short I'M DONE! I'm tired of my Sabertooth 990FX, it's gotta be replaced ASAP. I won't describe all its problems I do not want advice on fixing it i'm sorry, just warning you DO NOT GET this board. It is horrible, unstable, and inconsistent. Wasted $189.00 now. I will NOT RMA it, I'm going to blow it to pieces with my shotgun I think. I know the current power pull of my CPU is very high. I'm willing to spend $150 on a new MoBo. Is there a stable, non-ASUS and suitable replacement?
Don't be a fool; send in the board to asus and sell the replacement. As long as it has no physical damage, they may replace it. I use parcel post to send mine in; as long as you use a shipping label and package it in a separate box (keep the accessories) they will accept it. And if it's that bad, try flashing the bios with the latest version; if the flash fails and it won't post, then you'll have a legitimate excuse to rma it. And now for a replacement board: http://www.newegg.com/Product/Product.aspx?Item=N82E168... . You really don't need all the features of the sabertooth, and as you found out, spending alot won't guarantee you a good board.
I apologize for seeming silly, I just feel fed up with it. I'll probably RMA it and in process get another. The problem I have is I will not be able to sell the motherboard, people already know of its problems and are avoiding it like a disease from what I've seen. I could be wrong.