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Can Not get 16GBs of RAM to run @ 1866 on a Gigabyte GA-Z68XP-UD3

post #1 of 10
Thread Starter 
Hello Everyone,

Like the title states I am having problems running all 16 GBs of ram at 1866 in my newly built system. First off I will list my system specs in case any of it is relevant to the problem.

Intel Core i7-2700K
Gigabyte GA-Z68XP-UD3
2X CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 15000) Desktop Memory Model CMZ8GX3M2A1866C9
2X OCZ Vertex 3 120GB SSD
2X Western Digital VelociRaptor WD1500HLFS 150GB 10000 RPM
Asus GTX 480
Creative Sound Blaster X-Fi XtremeGamer Fatal1ty Pro
VisionTek Bigfoot Killer 2100 NIC
Antec TruePower Quattro TPQ-1000 1000W PSU

Like I said previously this is a newly built system. I put this system together for the first time about two weeks ago. In its first iteration it only had 8Gbs of RAM. At first I had problems running that at 1866. I would go into the Bios and load the XMP Profile1 and the system would not boot. It would give me an error about the RAM frequency then default to the 1333 speed. The 8GBs are in 2 4GB sticks. I removed one stick and could get the system to run the one stick at 1866 in all Four RAM slots. I switched the sticks out and could get the other one to run at 1866 in all Four slots. The problem ended up being I had the two in Slots 2 and 4, instead of the recommended 1 and 3. I installed the OS and everything was GRAVY. I was happy with it.

But then I began thinking how much better it would be if I had 16GB of RAM in it. So I ordered another 8GB of the same model of RAM. When it came I installed it in Slots 2 and 4, and didn’t have to change anything in the BIOS, all 4 sticks were running at 1866. At the same point I added the two SSDs to the mix so I had to reinstall the OS. Once the installation was done, came the numerous BSODs. It seemed like every code was different but had something to do with memory. My thinking immediately went to I got a defective stick in this latest batch. So I took the old RAM out and placed the new RAM in 1 and 3 and reinstalled the OS. It is rock solid, with the latest sticks running at 1866. So apparently all 4 sticks work great at 1866 when there are two of them in the system. When I add all 4, that’s when errors pop up in the OS side of things.

The only setting in the Bios that I altered in relation to memory is selecting Profile1 in the XMP part, just that one setting.

I have a feeling, or maybe it is just a hope that this is just some setting I never set in the BIOS that could get this system Jiving. PLEASE HELP!!!
Edited by loopup2u - 12/8/11 at 6:40am
post #2 of 10
Officially Intel Sandy Bridge only supports up to 1333 MHz. Anything faster is considered overclock and is not guaranteed to work. Ivy Bridge will officially support up to 1600 MHz. Also running 4 sticks of RAM will put more stress on Intel's memory controller than 2 sticks.
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Misaka
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post #3 of 10
My old mobo (fatal1ty 990fx) had this glitch.
Try something just as an experiment: go into memory timings and add +1 or even +2, then swtich from 42 to 46 and 2t.

try to boot afterwards.

worked for me... then you can fine tune later and all (I did increase a small step in voltage, but intel is different, so...)
    
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i7 3930k @ 4.4ghz (undervolted) ASUS Sabertooth x79 HIS HD7970 4x4g G.Skill Sniper 1866mhz 
Hard DriveHard DriveHard DriveOptical Drive
x2 SSD Corsair F3 (2x 120g) crucial m4 ssd (256g - steam) toshiba external usb 3.0 generic dvd r/w 
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Corsair H100 windows 8 pro + start button + no metro DELL UltraSharp U2212HM leadership gamer 
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post #4 of 10
Might be a stretch, but do you have any other sets of ddr3 in 1333 or 1600? You might just have defective slots 2 and 4 on the mobo, but with only that high 1866mhz ram its hard to say.
post #5 of 10
Quote:
Originally Posted by alexmaia_br View Post

My old mobo (fatal1ty 990fx) had this glitch.
Try something just as an experiment: go into memory timings and add +1 or even +2, then swtich from 42 to 46 and 2t.
try to boot afterwards.
worked for me... then you can fine tune later and all (I did increase a small step in voltage, but intel is different, so...)

+1

Loosen the timing and bump the voltage a bit. Lower the RAM speed as well. Then work your way back once it can boot.
Misaka
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Misaka
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Crucial M4 128 GB WD Caviar Blue 1 TB Lite-on DVD Burner Thermalright Venomous X 
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post #6 of 10
Thread Starter 
I did not mess around at all with the timings, just with the voltage.

So I was messing around with the voltage settings for the RAM and seem to have found a happy place. The RAM is supposed to run at 1.50V. I stepped up the voltage, and the OS became rock solid at 1.565V. But Battlefield 3 remained unstable until I reached 1.57V. That is a 4.7% increase over stock/recommended voltage. Here is my question.

How much damage am I doing to the RAM running it at that voltage?

I know there is no concrete answer but a general idea would help. I have not run a CPU or RAM above stock in like 10 years, so I am a little rusty. If it seems to work, would you use those settings? Is it bad to use stock timings and just bump up the voltage?

Here is my second little beef. When I first installed my system two weeks ago and only had 8GBs of RAM running at 1866, my Win 7 System rating was a 7.7 for my Ram, and 7.7 for my i7 2700K CPU. Now that I added the SSDs and now have 16GB @ 1866 my system is reading differently. The RAM is at 7.7. But to my DISMAY my i7 2700K is rated at 7.2.

So my question is does anyone know why Win 7 would report an i7 2700K @ 7.2?

Do you know how I can get it to at least report it at the 7.7 it originally rated it at?
post #7 of 10
I wouldn't worry about it too much. Generally with SB you want to keep RAM voltage below 1.65V. Anything above will be dangerous.

That said I'll email Corsair support, for reason that the RAM is unstable at stock specification. If it is rated at 1.5V I expect no voltage bump for its rated speed and timing.

Don't count on WEI too much, it is not a benchmark computer geeks use.
Misaka
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Misaka
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Hard DriveHard DriveOptical DriveCooling
Crucial M4 128 GB WD Caviar Blue 1 TB Lite-on DVD Burner Thermalright Venomous X 
OSOSMonitorKeyboard
Windows 7 Professional x64 (Host) Crunchbang Linux x64 (Guest) HP 2311x HP PS/2 Keyboard 
PowerCaseMouseAudio
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post #8 of 10
i would think it wouldnt mess it up at all. when you overclock you add more voltage. there are acceptable limits and i have heard 1.65 is safe so your mem should be fine.

on another note, is your CPU OCed? if so, all 4 slots filled will make your OC less stable and will need higher vcore.
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post #9 of 10
Thread Starter 
trumpet-205, thank you for your efforts!! I will defintately disregard that WEI rating.

Tipless, No I have not yet attempted to OC my CPU. Not sure if that is something I would want to do, or even feel I had enough knowledge to attempt.



Also, I received a suggestion from someone on another site that I should try to adjust my QPI/Vtt voltage & System Agent voltage. I wonder if doing that and keeping
my DRAM voltage at 1.5v would be a better choice.
post #10 of 10
it might help
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