Cant run 4 sticks at 1866 on ga-990fxa-ud3 MB Need help!

[Danimal551]

I just set up a new PC and I cant for the life of me get all 4 sticks of ram to run at 1866 speed. I can get all 4 sticks to run at 1600 with all the right timings and voltage by manually entering it in, but as soon as i go to 1866 i get boot failures. I am able to put only 2 sticks in and can run at 1866 by turning on XMP, and i can switch to the other 2 sticks and can do the same. I have tried to manually enter everything in and turning on XMP but no luck with 4 sticks.
I have done a ton of research and from what i can find i should be able to run all 4 at 1866 with my specs.

Ram: G.Skill ripjawsX (blue) DDR3 8gb x4 CL9-10-9-28 1.5v
MoBo: GA-990FXA-UD3 (rev 4.0) with up to date BIOS
CPU: AMD FX-9590 4.7GHz

If you need anymore info just let me know, I have searched all over online and cant find anything that had worked so any help would be greatly appreciated. Thank You.

 

[Sakkura]

The memory controller does not officially support 1866 with 4 DIMMs, so you're probably running into the limitations of what it's capable of.

 

[bignastyid]

I have done a ton of research and from what i can find i should be able to run all 4 at 1866 with my specs.

Really it took me a couple minutes to find this
"Note: Only one DIMM per channel is supported for DDR3-1866MHz and higher speed as using an AM3+ CPU."
http://download.gigabyte.us/FileList/Memory/memory_ga-990fxa-ud3.pdf
If you want 16Gb @ 1866 you should get 2 8Gb sticks.

 

[Danimal551]

So your saying in order for me to run all 32gb of ram i need to run it at 1800 or less?

 

[bignastyid]

So your saying in order for me to run all 32gb of ram i need to run it at 1800 or less?

With 32Gb you'd probably be stuck at ddr3 1600.

 

[Tradesman1]

No, I'v got 32GB of 2400/10 in my AMD rig, what you will prob need is to raise the DRAM voltage + 0.06 or so and set the CPU/NB voltage to around 1.3 (that feeds your MC (memory controller)

 

[Danimal551]

No, I'v got 32GB of 2400/10 in my AMD rig, what you will prob need is to raise the DRAM voltage + 0.06 or so and set the CPU/NB voltage to around 1.3 (that feeds your MC (memory controller)

Same motherboard?

 

[Tradesman1]

I'm running a Crosshair but Ive run 2133 sticks (full load on this same GB mobo and a few others (mainly the 990 chipset mobos

 

[Danimal551]

I'm running a Crosshair but Ive run 2133 sticks (full load on this same GB mobo and a few others (mainly the 990 chipset mobos

So if I up the DRAM voltage and CPU/NB voltage will that make it less stable?
This is a video editing PC so faster ram would be nice but being more stable is better.

 

[Tradesman1]

That will help stabilize the DRAM and thus the rest of the rig