Ram problems with mac pro 3.1

[thejuanvisu]

Hi
I posted some time ago with a similar problem, The problem this time is that i bought a compatible rams for my mac pro and when i put in 4x8gb ram modules it only recognises 16 ram instead of 32... Wath can i do?

 

[midniter]

This is what worked for me:-

Precautions:
Shut off power, pull the plug and all chords attached to the tower.
Use static gloves ( lolx no one does)

I originally had all 8 x 1GB Ram.
So making the total = 8GB. All 8GB showed up.

I purchased on Amazon in 2018. (2x 4GB)
A-Tech for Apple 8GB Kit 2X 4GB PC2-5300 667MHz Mac Pro MacPro2,1 MacPro1,1 Mid 2006 A1186 MA356LL/A Memory RAM

No I'm not promoting anyone. This is just what I bought.

Riser card 1
Slot1: 4GB
Slot2 : 4GB
Slot3: 1GB
Slot4: 1GB

Riser card 2
Slot1: 1GB
Slot2 : 1GB
Slot3: 1GB
Slot4: 1GB

So making the total = 14GB, but only 10GB showed up. I never bothered with it. lolx.

Now in 2019 I purchased 2x 4Gb again.
A-Tech for Apple 8GB Kit 2X 4GB PC2-5300 667MHz Mac Pro MacPro2,1 MacPro1,1 Mid 2006 A1186 MA356LL/A Memory RAM

Riser card 1
Slot1: 4GB
Slot2 : 4GB
Slot3: 1GB
Slot4: 1GB

Riser card 2
Slot1: 4GB
Slot2 : 4GB
Slot3: 1GB
Slot4: 1GB

So making the total = 20GB, and all ram showed up.

When it comes to PC desktops, I was told, the best practice is to put similar cards in 1/3 or 2/4 slots, but it seems Apple does not work that way.

Hope this helps someone.

 

[barmann]

Hi
I posted some time ago with a similar problem, The problem this time is that i bought a compatible rams for my mac pro and when i put in 4x8gb ram modules it only recognises 16 ram instead of 32... Wath can i do?

There are a number of possible issues ; here is one of many old threads discussing some of them .

I had the same problem with my MP 3.1 as you, a few modules in a set of new RAM modules not being recognized ; in my case I had to reseat them several times , and that fixed it .

Cleaning the Ram slots and contacts on the Ram modules , and/or carefully moving the modules in and out of the slots a few times might help .

First , I'd check system report to find the memory slots that aren't showing Ram that is installed .
Then, I'd switch around the Ram modules and try again - making sure the Ram is installed in the right configuration for the MP 3.1 ( see link above ) .

Again, there a several things that could be wrong, bad Ram or riser boards etc. , but I'd start with this .