iMac late 2013 Memory failure !

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i tried apple diagnostic tests today out of curiosity first time , got error ppm003 related faulty memory module.

never experienced crash or panic. boot time 7 seconds , system smooth.

have 32gb installed of ram not sure 1 faulty.

how can find out 1 ? guess it's dual channel not possible test them 1 one.

hint please ?
 

so tested 2 stick or rams , no errors found.

tested other 2 sticks , no errors found.

installed 4 sticks , tested again, have memory failure.

mean motherboard defective ?
 


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