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Trouble getting RAM to reach 1866MHz on Biostar TA990FXE mobo - Page 2

post #11 of 24
Thread Starter 
OK... I have been searching the web like a madman, and found something I had to try.
I took out 2 DIMMs, reducing me to 8GB(2x4GB) of RAM. Of course I made sure that the 2 DIMMS were in the proper slots to maintain Dual-Channel mode.
Then I went into BIOS and set the DRAM FREQ. to 1866 again and left all particulars set to auto.

!!!!! IT WORKED !!!!!!

so I checked CPU-z and noticed the timings were nowhere close to the XMP settings for my RAM!
now i reboot into BIOS and change ALL the settings available from "auto" to the exact XMP values for this RAM.
Reboot....
.....
.....
now everything works great!! I have the full 1866MHz and timings that I should!

But.....

This only works with 2 DIMMS! :-(
Even with identical values on the second set of channels, when I put the other 2 back on the board, I had the code "54" on the LED display and nonstop beeping, and no POST Screen. When I powered down removed the second set of DIMMS, and rebooted, all was well and good again.

I feel like I am halfway to my goal now.

I bought 16GB of ram to use 16GB, not 8GB. What do I do now to get it to work with all 4 DIMMs?
Any suggestions to help me get further?
Edited by mcot98 - 2/12/12 at 9:25pm
post #12 of 24
I have the same issue with mine.

FX-8120
GA-990FXA-UD3
Patriot Viper 1866MHz

2 DIMMs work fine but as soon as I add the other 2 after post I get the same message.
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post #13 of 24
Try increasing the voltage now and see if it works.

Did you buy a quad kit or did you buy a pair of 2 RAM sticks? Maybe switch the RAM around to make sure none of them are dead.
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post #14 of 24
All 4 DIMM's work at 1600MHz. If I have 2 in I can configure the timings and speed for 1866MHz stable, shut the computer down, put the other 2 in and after post message comes up that they were set to default 1333MHz.

Speed: 1866MHz
Voltage: 1.65v
Timings: 1t-9-11-9-27-50
Edited by cmac68 - 2/13/12 at 8:03pm
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post #15 of 24
from the research I have done, it appears that the BD is certified at 1866 for only 2 dimms. if you want to fill all 4 then you will be hard pressed to get all 4 stable at 1866. looks like most people are settling for 1600mhz x 4dimms. its a shame but the verification on the 1866 x 2dimms came from an email sent by AMD. only certified for 2dimms @ 1866, not 4.
post #16 of 24
Thread Starter 
Quote:
Originally Posted by kenmore81 View Post

from the research I have done, it appears that the BD is certified at 1866 for only 2 dimms. if you want to fill all 4 then you will be hard pressed to get all 4 stable at 1866. looks like most people are settling for 1600mhz x 4dimms. its a shame but the verification on the 1866 x 2dimms came from an email sent by AMD. only certified for 2dimms @ 1866, not 4.
I am extremely disappointed to hear this.
Is the restriction because of the memory controller on the CPU or is it the board that is stopping it?
BTW, I bought them new as a quad kit. But I have rotated my DIMMs anyway and they all seem to work just fine.
post #17 of 24
Your probably going to have to up your NB voltage to make this happen.. Try volting it to 2.5


edit:

also

you might have to up your voltage slightly on your ram . I have to run my speced 1.65 ram at 1.6685... even though Im not even hitting 2133mhz.
Im at 1950mhz

but you definitely have to up your NB voltage
Edited by Bushmaster - 2/14/12 at 10:06pm
post #18 of 24
You need to increase CPU-NB voltage some. NB voltage is applied directly to the NB (doesn't do much). CPU-NB voltage is applied to the CPU's memory controller.
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post #19 of 24
Quote:
Originally Posted by kenmore81 View Post

from the research I have done, it appears that the BD is certified at 1866 for only 2 dimms. if you want to fill all 4 then you will be hard pressed to get all 4 stable at 1866. looks like most people are settling for 1600mhz x 4dimms. its a shame but the verification on the 1866 x 2dimms came from an email sent by AMD. only certified for 2dimms @ 1866, not 4.

This sounds right.. I know with ANY board that running more dimms will reduce your OCing ability.. ITs always best to stick with Less dimms for better OCing...
post #20 of 24
Quote:
Originally Posted by Dopamin3 View Post

You need to increase CPU-NB voltage some. NB voltage is applied directly to the NB (doesn't do much). CPU-NB voltage is applied to the CPU's memory controller.

ok...

Just stating what I had to do to get my system to 1950 mhz.... Upped the NB, and Ram ... obviously the Vcore too cause Im at 4.0 ghz.... left the cpu-nb on auto..

I have asus ROG connect... IF I increase my cpu-nb voltage while running prime95.. IT fails....

So I disagree with you entirely .... edit: at least in my case smile.gif but then again Im not running 4 dimms, and Im running a thuban
Edited by Bushmaster - 2/14/12 at 10:39pm
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