MP 1,1-5,1 MacPro 5.1 Ram Issue

Chrisf1977

macrumors newbie
Original poster
Oct 16, 2018
13
1
Hello,

while cleaning my MacPro 4.1(5.1) I have probably destroyed a memory module (or memory slot) in slot 1.
After cleaning and startup the Mac a red LED glow near at the memory slot 1. MacOs tells me in Slot 1 is no Memory Module installed. The I have removed the memory module from memory slot 1 and startup the Mac again. The red LED is now off. The I have installed the memory module from slot 1 into the slot two. Now, after the startup, the red LED on slot 2 glow. Then I have installed additionally the memory module from slot 2 into slot 1 and after startup the LEDs from slot 1 and from slot 2 glows. :confused:

Okay, for me is this a sign that the memory module from slot 1 is destroyed so I have buyed two new memory modules. But, if I install this two modules into slot 1 and slot 2 the white power LED on the front of my Machine flashes if I power on the machine. The same if only one new memory module ist installed (in slot 2, slot 1 empty).
Have i buyed the wrong memory modules?:rolleyes:

Old memory modules (4 pieces installed in my Mac):
91mwnBHkTvi0QIzZnr1zpg.jpg

New memory modules (2 pieces for slot 1 and 2):
LIH6QG3gSc6c+%gcwyT3HQ.jpg

My Mac:
Bildschirmfoto 2020-03-12 um 17.48.59.png

Thanks for answers!
Chris
 

tsialex

macrumors 604
Jun 13, 2016
7,648
8,358
Brazil
Can i use 4xRDIMM or 4xUDIMM?
Yes, you can.

Please note that the best memory performance possible will be 3x16GB RDIMMs, Nehalem and Westmere Xeons are tri-channel and using 4 DIMMs have some penalties with memory access.

If you have an application that works best with more memory than faster memory, use all 4 DIMM slots, while if you have an application that works best with faster memory than more memory, use just 3 DIMM slots.
 

Chrisf1977

macrumors newbie
Original poster
Oct 16, 2018
13
1
Okay, thank you! Then i will change the buyed memory modules and buy 3x16gb RDimm 😬
 

tsialex

macrumors 604
Jun 13, 2016
7,648
8,358
Brazil
Okay, thank you! Then i will change the buyed memory modules and buy 3x16gb RDimm 😬
Dual rank only. Read the memory thread and see the models that are known to work.

 
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Chrisf1977

macrumors newbie
Original poster
Oct 16, 2018
13
1
3F578C96-F10A-47BA-96B4-7AE03C4FDE33.png
3F578C96-F10A-47BA-96B4-7AE03C4FDE33.png

Sorry last Question: Is this the right module type you can see on the screenshot?
 

Snow Tiger

macrumors 6502a
Dec 18, 2019
854
567
get three of these and you'll be happy :

16GB = Samsung M393B2G70BH0-YH9 (low voltage) .

For a total of 48GB at 1333 MHz .

Remove all other ram from your System first .
 
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Chrisf1977

macrumors newbie
Original poster
Oct 16, 2018
13
1
Good Morning,

thank you all for your help. Now i have buyed and installed three of the Samsung M393B2G70BH0-YH9 Modules. For the the Modules i have payed 75€ incl. transport on ebay :)
 
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