Can't adjust RAM from 1333MHz to 1866MHz

[12slvrlancer]

Ok, so I have had this problem for awhile, and can't seem to figure it out. I have a Gigabyte 970A-UD3 with a FX-8120 3.1GHz CPU installed. I used 4 sticks of 4Gb Corsair Vengeance 1866MHz RAM. Now I have been about to successfully overclock the CPU to run at 3.5GHZ but anytime I try to mess with the RAM settings, either 1866 or 1600MHz it gives me a boot failure and reverts everything including the CPU speed back to default. Any ideas?

[MisterEd]

You may be out of luck going above 1333MHz with four sticks of RAM unless someone can suggest memory settings that will make it stable.
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Qualified Vendors List (QVL) forGA-970A-UD3
http://download.gigabyte.us/FileList/Memory/memory_ga-970a-ud3.pdf

Right below "DDR3 1866" there is warning in red:
Note: Only one DIMM per channel is supported for DDR3-1866MHz and higher speed as using an AM3+ CPU.

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DDR3 Memory Frequency Guide
http://support.amd.com/us/kbarticles/Pages/ddr3memoryfrequencyguide.aspx

[Tiger]

4 sticks of 4Gb Corsair Vengeance at 1866MHz RAM is not a supported configuration for an AMD FX CPU, 2 sticks is. You may want to lower the memory clock to 1600MHz with 4 sticks. Overclocking is also an option to run at 1866MHz speed, however you wrote that your overclock failed.

[hyp3rtraxx]

I am running 4*4 kingston hyper x beast series 2133mhz@2080mhz with the fsb overclocked. But when i try to run them without the fsb overclock i can only run them at 1333mhz. So well i have my fsb clocked. I am running the gigabyte fxa990 ud5 board.

[Vezina]

The BIOS should have a multiplier there for higher clocks on the RAM , if the CPU is a FX one.
The UEFI interface though may have the setting strangely hidden or something.Enable manual DRAM control.
Look in the manual for how to do it.