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CMX8GX3M2A1333C9 and GA Z77X-UD3H, getting constant BSODs


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Hi, after some problem with my old motherboard, i've decided to pick up new Gigabyte Z77X-UD3H rev 1.0, and with the new motherboard i thought i should add some more memory. I've already used XMS3 for quite some time:


894880 130203262

1333 MHz 8Gb(2x4)

9-9-9-24, 1.5V, ver 2.13


So i've decided to pick another kit just like that, new sticks:



1333 MHz 8Gb(2x4)

9-9-9-24, 1.5V, ver 8.11


Everything worked smooth for a while, but then i started to get constant 0x3b and 0x50 BSODs. After some googling i've found out that these bad boys happen because of RAM issues, video memory issues or dated drivers, so i've updated all of my drivers, updated BIOS to the latest version and double-checked all the contact and temperatures. The problem persisted, but after some investigating i came to the realisation that these BSOD happen when i try to:

1. Exit fullscreen mode

2. Right-click my mouse to bring out pop-up menu

3. Getting taskbar notifications

Basically, when PC tries to render some new parts of the GUI.

So after some more googling and reading i've disconnected my second monitor and that worked, for a while. BSOD became rarer, but still had the same source. So after testing my vide memory i've decided that it's time to run memtest for as long as i can, and after full day of testing with around 10 passes it showed no errors (i've run memtest before for 4 passes and it showed no errors too).

After reading that memory could be showing no errors, but still fail while under real conditions i've removed new sticks and left the old sticks and that removed my BSOD (at least for the time i tested), installing new sticks and testing them (Going fullscreen and back, righclicking like crazy) gave me BSODs almost right away.

So the sticks must be faulty i thought, but first i've inserted just two sticks from another PC, they're the same CMX8GX3M2A1333C9 except, they're ver. 8.16. And i've got the same BSOD almost right away.

Almost giving up and thinking that memory is not the culprit here, i've connected my second monitor back, but it seems that BSODs became as rare with two monitors as they were with one. So i've googled and read some more and found out that using 4 sticks they sometimes can be undervoltaged, so i've got into BIOS and selected XMP profile 1, it sets

Freq. 1333

DDR voltage 1.60

VTT votlage 1.05


And it cured my BSODs, for two-three days.

Running out of options i've replaced my videocard with the one from the other PC (the one i've grabbed the memory, that runs smoother than silk there) but it gave me another BSOD just now, ruling out the videocard.

So i'veruled out faulty sticks (tested the same kit from the other PC where it works fine), faulty videocard (tested another one), undervoltage (bumped it up a bit in BIOS).

Configurator suggests than i use CMX8GX3M2A2000C9. While i've yet to find that my current sticks and MB have compatibility issues.

So, as far as i can tell it's either still the voltage/freq issue, compatibility issues, faulty motherboard or something Windows related. Can you suggest some more things i should try, maybe more safe voltage-timing tweaks?


I'm currently running on two old stick, hoping they'll show no signs of crashing. I also installed all the microsoft hotfixes regarding those bsods, including multimonitor fix, 2D rendering fix and some more. BIOS is up-to-date F18.


Specs summary:


i5-3570 CPU @3.40 GHz 3.80 Ghz

GeForce GTX 570

Windows 7 Professional

Corsair CX600 PSU

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What it sounds like is that you have two memory kits despite them having the same part number , that just do not play well with each other. In fact Corsair does not recommend or support mixing/combining memory for this very reason. There is just no way they can guarantee that any two random kits (even though they are the same exact part number)will run with each other because they all were not tested or packaged together. Having matched memory with these new boards is a must.


If you notice your kits are different versions meaning they are constructed from totally different memory chips. This is another reason why you never add ,just replace memory. They may have the same specs and so on, but internally there are small differences that don't play well with the other version.



If they all test good then it would probably be best to return the kit you just added and get a single matched 16 kit that is meets the new XMP1.3specs for that board


And if i can make one other suggestion and that would be to get at least 1866mhz memory if you are rendering. Your MB/CPU is capable of running up to 2133mhz memory without much sweat. It would make a huge difference o rendering times and performance.


One other thing, with you current Mb and CPU there is no need to use the XMP profile. Your cpu supports 1600mhz memory natively. So your not overclcoking...your underclocking it. When you first insert your memory it will default to 1333mhz anyway.

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That's why i'm asking, what kind of test should i run other than running each stick with memtest individually?

I'm kinda running out of options and i don't really to buy new memory or MB without being absolutely positive that it's a faulty hardware issue and not some minor tweaking/compatibility issue.

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If you have tried memory from another system and even it's producing the same results, then it's either a bad OS/Drivers instal or your MB is bad. There really isn't much else you can do in the way of testing though.


Try reinstalling windows first and if that doesn't cure it, then you need to contact Gigabyte.

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You have the same board as me I see. I believe (but might be wrong of course) it's very picky about memory. I would suggest testing the modules you have in completely different PC. Cycling Memtest86+'s test 6 for a few hours seems sufficient from my own experience.
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From the OP's original post:

So after testing my vide memory i've decided that it's time to run memtest for as long as i can, and after full day of testing with around 10 passes it showed no errors (i've run memtest before for 4 passes and it showed no errors too).


So i'veruled out faulty sticks (tested the same kit from the other PC where it works fine),


Unfortunately BSODs occur even when i use only 2 new sticks without mixing them with the old ones. I also grabbed almost identical sticks from the other PC and they too cause BSODs.

But it was a good suggestion though!

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