HT202892: Mac Pro (Late 2013): Memory specifications
Learn about Mac Pro (Late 2013): Memory specifications
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Helpful answers
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May 12, 2016 5:08 PM in response to SchoolMontainby theratter,You can make an appointment at the Apple Retail Store - Genius Bar and take it in for service. You can also look for an Apple Store - Find a Store - Apple.
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by Grant Bennet-Alder,May 12, 2016 6:56 PM in response to SchoolMontain
Grant Bennet-Alder
May 12, 2016 6:56 PM
in response to SchoolMontain
Level 9 (61,317 points)
DesktopsExchanging the cards showed that all memory cards are working fine.
...working fine at the time that you checked them.
It would be really nice if once a DIMM made an error, it would fall over dead. But that is not how they work, and it is made much more complex by the Error-Correction Memory in these Macs.
The error-correction logic is applied very aggressively at Startup, and any DIMMs that experience any error (correctible or not) during those few seconds will have its slot declared "empty" and that DIMM will not be used. But there is no historical carry-forward -- the next time you do a restart, they are all tested from scratch, and DIMMs that failed last time may pass the next time.
When a correctible error occurs in the running system, it is corrected in Hardware in one extended memory cycle, and the errors bits are checked and tabulated by a background process. They are available as a STATIC read-out using this display.
About this Mac > ( System Report ) > Memory:
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May 12, 2016 7:34 PM in response to Grant Bennet-Alderby SchoolMontain,OK, I understand this startup check and the consequences. In the last 3 hours I applied a careful cleaning to the slot 2 and 4. Now slot 4 came back again. I got 12 GB of memory. And I checked slot 2 by an microscope and saw that the long contacts to the left are covered by a substance like candle wax, some contacts more some less. The round contacts to the right looks fine. I tried to clean them very carefully but I think that I moved the waxy thing from one site to the other only. It is still not working. Now only slot 2 is outstanding. Do you know any contact cleaner that clean and protect these contacts?
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by Grant Bennet-Alder,May 12, 2016 7:40 PM in response to SchoolMontain
Grant Bennet-Alder
May 12, 2016 7:40 PM
in response to SchoolMontain
Level 9 (61,317 points)
DesktopsRadio Shack used to sell contact cleaner is a spray can with a stiff brush tip. I am not sure where you would get that today.
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by lllaass,May 13, 2016 12:46 AM in response to Grant Bennet-Alder
lllaass
May 13, 2016 12:46 AM
in response to Grant Bennet-Alder
Level 10 (190,352 points)
Apple Watch -
May 17, 2016 10:15 AM in response to lllaassby SchoolMontain,I tried my best in carefully cleaning the slot with Spray Duster and Isopropyl-alcohol but without success. Slot 2 is still not working. Is there a replacement required? Can this be done by a 'normal' service provider or is there required to send the Mac Pro to Apple? Next Apple Store is about 200 km away.
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May 17, 2016 10:24 AM in response to SchoolMontainby lllaass,I do not think that the slots are really replaceable since they ae soldered to the logic board.
To replace the slots requires special equipment.
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May 17, 2016 10:52 AM in response to lllaassby Grant Bennet-Alder,Apple would do a repair-by replacement on the motherboard. You could ask for that if under warranty, otherwise it may be many hundreds of dollars.
The impact of leaving a slot open should be less than five percent of memory speed, but you cannot get to "all slots filled" total memory.
