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I apologize for this inconvenience.
This could be a compatibility issue; however, I believe it is worth updating the BIOS. You may also use manual settings for the memory as suggested by the manufacturer.
Have you reconfigured the BIOS to operate the SODIMMs at 1.35V? If not, it will be attempting to operate them at 1.5V and this may fail once two SODIMMs are present. To change this (hoping I am remembering the names properly; I don't have a system in front of me), go into Visual BIOS, select Advanced Configuration, then Performance and finally the Memory tab. Select Manual (User Defined) Configuration and then change the Voltage parameter from 1.5V to 1.35V. Once this is done, you should be able to use two SODIMMs properly...
I do have the exactly same problem with Intel NUC 3217BY and two 4GB Crucial memory modules (DDR3, PC3-12800 1.35v 204 PIN) : I am running ubuntu and the "memtester" tool shows errors when using two modules and no error when I remove one of them.
But unfortunately, setting the voltage to manual and asking to operate the memory at 1.35v does not help : I still have errors :-(
What should I do now ? Try a bios update (my version looks quite old : GKPPT10H.86A.0032.2012.1127.1710) ?
Mauro, what is your bios version ?
I recommend using high density CT51264BF160BJ and not to use CT2KIT51264BF160B
CT2KIT51264BF160B is somtimes listed as compatable but sometimes not.
I know CT51264BF160BJ is OK but CT2KIT51264BF160B may cause problems.
I also sent a question to Crucial regarding this and got this reply:
The different between these parts is the density meaning
the number of black DRAM chips that make up the module. Part CT51264BF160B is a
low density version which will have 16 chips in total. Part CT51264BF160BJ
(note the J at the end) is high density meaning it will use only 8 DRAM chips
on the module.
The Intel D54250WYK will accept high density 4GB
modules only and this is why you are experiencing instability.
So Legit Review sent us in the wrong direction.....
Guys, it looks like the Crucial memory part # CT102464BF160B was tested in our labs, but it did not pass.
It was a mistake to include it on the list. We apologize.