I have for the longest time tried getting my 1866 RAM to work at that frequency but the only way my bios will launch is if it is at 1333. I will post below everything in my computer, with the links to exactly where I got them, if anyone can help that will be greatly appreciated!

This isn't even close to my first computer built but I still am not very knowledgeable when it comes to the bios and it's settings.

MOBO: ASUS Sabertooth 990X
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131877

CPU: AMD FX-9590 Vishera (with liquid cooling)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819113351

RAM: 2X8GB G.SKILL Ripjaw X series 240-pin DDR3 1866
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231528

GPU: XFX Double D Radeon HD 7970 3GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150596

PSU: Rosewill Xtreme 750W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182067

The following I don't think you'll need but I'll add it anyways:
Case: http://www.newegg.com/Product/Product.aspx?Item=N82E16811139013
(with 11 non-stock fans installed, two for liquid cooling) http://www.newegg.com/Product/Product.aspx?Item=N82E16835103052
SSD (OS): http://www.newegg.com/Product/Product.aspx?Item=N82E16820147193
HDD (files): http://www.newegg.com/Product/Product.aspx?Item=N82E16822236623
Monitors: triple monitor stand and 3 of these: http://www.newegg.com/Product/Product.aspx?Item=N82E16822236623