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Upgrading the memory on Mac Pro 5.1

Springtech

Springtech

macrumors newbie
Original poster
Nov 23, 2016
9
0
Monticello, IN
I currently have 2gb x 4 (8GB) in my quad core 2010 5.1. I bought 4gb x 4 and installed it and it only read 2gb per slot. I've check that it was seated correctly and try again still only reading 2gb per slot. I return this set thinking it's defective and the replacement memory is doing the same thing. Any ideas? How do I check for a problem with my machine? This kit is used Kingston memory.
  • 4 x 4.0GB PC10600 DDR3 Kit
  • Size: 4GB (4096MB)
  • 240-pin SDRAM DIMM
  • 512M x 72, Dual Rank ECC Memory Module
  • Data Rate = 1333MHz
  • Module Bandwidth 10.6GB/s
 
Reset PRAM by holding

cmd, option, P, R

during boot until you hear the boot chime twice and release. This should reset your system to see the new ram configuration.
 
Springtech said:
I currently have 2gb x 4 (8GB) in my quad core 2010 5.1. I bought 4gb x 4 and installed it and it only read 2gb per slot. I've check that it was seated correctly and try again still only reading 2gb per slot. I return this set thinking it's defective and the replacement memory is doing the same thing. Any ideas? How do I check for a problem with my machine? This kit is used Kingston memory.
  • 4 x 4.0GB PC10600 DDR3 Kit
  • Size: 4GB (4096MB)
  • 240-pin SDRAM DIMM
  • 512M x 72, Dual Rank ECC Memory Module
  • Data Rate = 1333MHz
  • Module Bandwidth 10.6GB/s
Click to expand...

I have been running 3 of these in my 5,1 sine I got it new in 2012. I don't remember having to reset the PRAM, I think it worked on first boot. OS X even said something like "Memory Installed Correctly" or something. It was a nice message. ; )

http://www.datamemorysystems.com/dm61-765/
 
Last edited:
chriz_r said:
Reset PRAM by holding

cmd, option, P, R

during boot until you hear the boot chime twice and release. This should reset your system to see the new ram configuration.
Click to expand...
I did try the PRAM reset with no luck.
[doublepost=1480847709][/doublepost]PRAM reset didn't work work, I tried that first thing, I've also tried changing the order to see is something changed but nothing. I've put just one card in the first slot, still read 2gb, I repeated for each slot and it still read 2gb. Very frustrating
 
Springtech said:
I did try the PRAM reset with no luck.
[doublepost=1480847709][/doublepost]PRAM reset didn't work work, I tried that first thing, I've also tried changing the order to see is something changed but nothing. I've put just one card in the first slot, still read 2gb, I repeated for each slot and it still read 2gb. Very frustrating
Click to expand...

Are you saying when you put a 4gb chip in it reads as 2gb?
If so, are you sure they are 4gb chips.
 
You can also try to run the Memory Slot Utility.
It is in your System folder, then Library, and look for "Memory Slot Utility"
 
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No, I'm not sure. The first set only read 2gb and was supposed to be 4gb, I return that set and this is the second set doing the same. Is there a way to verify the chip?
 
Restart your Mac and hold option-D for apple diagnostics, and do a quick test.
 
The simplest answers and solutions to our questions are what we all usually ignore. Hope the seller gives the right one next time around!
 
chriz_r said:
The simplest answers and solutions to our questions are what we all usually ignore. Hope the seller gives the right one next time around!
Click to expand...
So true, I Think I'll just get a refund and purchase some place else.
[doublepost=1480871785][/doublepost]
h9826790 said:
Any photos of the RAM stick? (mainly need to read the label)
Click to expand...
See below and thanks I would have never thought to google the original manufacturer
 
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