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Can't adjust RAM from 1333MHz to 1866MHz

Can't adjust RAM from 1333MHz to 1866MHz
« on: September 14, 2013, 10:18:03 pm »
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

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Re: Can't adjust RAM from 1333MHz to 1866MHz
« Reply #1 on: September 15, 2013, 04:24:48 am »

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.

===================================================================================

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

Gigabyte GA-990FXA-UD3 | AMD FX-8350 | Corsair H60 | GSkill RipjawsX (2x4GB) | ASUS GeForce GTX 560 | Windows 7 Ultimate
ASUS M4N82 Deluxe | AMD Phenom II X4 960T | Corsair XMS2 (2x2GB) | PNY GeForce GTS 250 | Windows 7 Home Premimum

Tiger

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Re: Can't adjust RAM from 1333MHz to 1866MHz
« Reply #2 on: September 15, 2013, 09:15:59 pm »
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.
GA-990FXA-UD3 Rev. 1.1, FX-8350, G.Skill F3-14900CL9D-8GBSR, Cooler Master Hyper 212 Plus, Diamond Multimedia Radeon HD 7850, (2) WD VelociRaptor WD3000HLHX - RAID 0, Cooler Master Real Power Pro 850 Watt, Windows 7 64-bit Home Premium Edition

Re: Can't adjust RAM from 1333MHz to 1866MHz
« Reply #3 on: September 18, 2013, 01:42:10 pm »
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

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  • If it s not broken, fix it until it is !
Re: Can't adjust RAM from 1333MHz to 1866MHz
« Reply #4 on: September 19, 2013, 11:14:52 pm »
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.
Over & Out !

AMD FX (APU-s included) users should install - KB2645594 & KB2646060 under Windows 7

1.ASUS Sabertooth 990FX 2.0 + FX 6300 + H60
2.MSI A88X-G41 PC Mate + A8 5600K + Hyper TX 2
3.Gigabyte F2A75-D3H + A4 5300
4.ASUS AM1M-A + Athlon 5150