RAM slots not working correctly. PLEASE HELP

lennyjr358

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Jun 30, 2013
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specs.

motherboard intel dp67bg
intel i5 2400k
16 GB Cosair vengeance ddr3 ram
2 EVGA 550 ti 2gb running SLI
Thermaltake TR2 600W PSU

So my problem is that 2 of my RAM slots don't work. All 4 slots worked fine in this setup for almost a year. Now If i put the same stick of ram in slot 1 or 3 it works fine. 2 or 4 and i get error 27 on my motherboard. I thought it was definitely my mobo so i had it RMA'd with intel. The board they sent me did the exact same thing in the exact same slots. They sent me a 3rd one and again the same thing. Now they are telling me that it isn't the mobo but they don't know what it could be.

I was told by a friend that it could be my PSU not providing enough power to my mobo but he doesn't strike me as all that knowledgeable about this type of thing, so I was wondering if anyone else had come across this problem or what my options are to fix it.

Thanks in advance to anyone who takes the time to help me out.
 

lennyjr358

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Jun 30, 2013
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I have the latest BIOS and it is an i5-2400

and tradesman1 my RAM is CMZ16GX3M4A1600C9 all out of the same package. was running on auto, I changed to XMP-1600 and still having the same problem.

 

lennyjr358

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Jun 30, 2013
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I just tried putting it at 1333 8-8-8-24 and it wouldn't boot. had to hit the back2bios button just to get it to turn on for more than a second.
 

lennyjr358

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Jun 30, 2013
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The sticks are fine for sure. i can use any of my 4 in the 2 slots that work and pass memtest every time. I have also tested them in a different setup with no problems. I just don't understand how 3 mobo's in a row would all have the same issue in the exact same slots. Intel supposedly tested the 3rd one before they sent it out and said all 4 slots were definitely working. I have read that a lot of people have had RAM problems using thermaltake psu's with this mobo but not exactly what i'm experiencing.
 

lennyjr358

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Jun 30, 2013
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Yes tRFC was 128. I tried raising that and the voltage, than adding the sticks and got the same result. error code 27.
 

lennyjr358

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Jun 30, 2013
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I was reading another thread on this forum and i might have stumbled upon the answer. I have a water cooler and the back plate sits pretty close to the slots that don't work. Maybe it's causing a short? I don't really know but I think tomorrow i'm going to take everything out and put a piece of cardboard under my mobo to see if that helps. seems too simple but I've tried everything else I can think of. Considering intel's reputation it could also easily be loose soldering or something similar, so I can get a better look at that as well. I'll update some time tomorrow. thank you for your help!