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Old 02-13-2013, 08:23 AM
faschimi faschimi is offline
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Default CMX8GX3M2A1333C9 - Not so identical kits

Dear folks,

In December 2010, I purchased from Amazon.com a CMX8GX3M2A1333C9 memory kit, to be installed on a new computer which I was assembling. The two 4 GB memory sticks were installed on an ASROCK 890Fx Deluxe4 motherboard, along with an AMD Phenom II X6 processor.

During the past two years the memory has worked flawless, so I decided to purchase a second CMX8GX3M2A1333C9 kit, again from Amazon, to expand the total RAM memory to 16 GB, the maximum allowed by the motherboard. And I did it clicking on the same advertised product on Amazon which I purchased two years ago:
http://www.amazon.com/Corsair-PC3-10...0716344&sr=1-1

Believing that I was dealing with four identical memory sticks, I have just installed the two new sticks and turn on the computer. And I got... BSOD. So, I would have to run some tests on Memtest86+...

First, I checked the memory settings on the BIOS setup. When I installed the first two sticks two years ago, I have to manually set the frequency, the voltage and the timings to 1333 MHz, 1.5 V and 9-9-9-24, because in the AUTO settings these values were completely different (1066 MHz, 1.6 V and 8-8-8-20 - and these AUTO settings also causes BSOD).

I tested on Memtest86+ the sticks of the new kit, first one at a time, then the two sticks together and finally the four sticks. I also did some "fine tune" in the BIOS settings, then cleared the CMOS... but the fact is that each kit works alone, but when they are all together, Memtest86 reports some few errors, almost always in tests #4 and #6:
12022013345.jpg

I also ran CPU-Z and this is the weird situation: despite of having the same part number, the sticks apparently do not have the same specifications...

- Stick of the first kit (purchased in Dec/10):


Stick photo: 12022013346.jpg

- Stick of the second kit (purchased in Jan/13):


Stick photo: 12022013348.jpg

So, the questions are:
- Why do these sticks have different specifications, if they have the same part number?
- Is there a way to put all these sticks to work together, without BSODs or errors reported by Memtest86+?

The "memory" section of the motherboard BIOS setup is very comprehensive, there are lots of parameters to be set. Maybe I'm missing something…

Any help will be much appreciated. Thanks in advance!
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bsod, cmx8gx3m2a1333c9, frequency, memtest86+, timming

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