Ram issues with new rig

OwnedTBH

Distinguished
Oct 6, 2009
17
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18,510
Hello would like some help with my new rig

Finished building it the other day it booted up fine i checked cpuz and noticed my ram was running around 1300 instead of 1866. I loaded the bios and enabled XMP profile that switched the ram to the correct speeds but it would not boot.

Today i have tested each stick and they all work fine so i put one it at a time to check they all worked at the correct 1866 speed. I continued to load the other sticks which were all working once i got to the forth stick the computer would blue screen i switched the slots and ram to see if that would work but nothing the computer will not accept the 4th ram stick no matter what slot i use does anyone know would could be the cause of this? am out of ideas

i have updated the bios to the latest version and am also getting prime95 warnings on some cores after a few minutes of testing which i think is related to the ram issue.

MB : Gigabyte 990FXA-UD5 rev 3.0
CPU : AMD FX 9590
GPU : Geforce GTX 980ti
PSU : Corsair AX1200i
RAM : Cosair vengence pro series 32GB DDR3 1866mhz
 

bignastyid

Titan
Moderator
Try running it at 1600. With 1866 and higher the board only supports 1 dimm per channel(with 4 sticks you have 2 per channel).
"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-ud5.pdf
It might be possible to get it to run at 1866 but you'll need to start tweaking voltages and timings for the ram and memory controller.
 
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