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So after few weeks of learning, finally managed to fix broken Mac Pro 2006 and get Ubuntu 20.04 working. However I'm now running into a problem as only 2GB is showing in my system monitor out of 32GB installed. However on lshw -c memory I'm getting 32gb with all 8 banks of memory being correctly recognized. I also had all 32gb on Lion X. As far as I'm aware this Mac has 64x architecture with 32x EFI. There was some workaround of getting 64 ubuntu installed. Also one of 8 cores is most of the time on 100% when doing nothing. I'm not sure if that has anything to do with it. I have tried taking some of RAM out and rearranging but always ended up with 2gb. I tried to upload pics of stuff but couldn't as I'm new here. Thanks

              total        used        free      shared  buff/cache   available
Mem:          1.9Gi       1.1Gi       268Mi        27Mi       608Mi       685Mi
Swap:         2.0Gi        11Mi       2.0Gi

memory

   description: System Memory
   physical id: 20
   slot: System board or motherboard
   size: 32GiB
   capabilities: ecc
   configuration: errordetection=ecc

dmidecode 3.2

Getting SMBIOS data from sysfs.
SMBIOS 2.4 present.
Handle 0x0020, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: Single-bit ECC
Maximum Capacity: 64 GB
Error Information Handle: Not Provided
Number Of Devices: 8
YungKaymak
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1 Answers1

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After a month of trial and error I have finally solved the problem. I went and install Lion OS X again and then I have done 2 Firmware updates. One was SMC Mac Pro 1,1 and another one was EFI Mac Pro 1,1. Not sure how that affects RAM but it worked. Anyone interested can find downloads here https://support.apple.com/downloads/macdesktops

After I have done that I've run my ubuntu again and it was now showing all 32GB. I have run few mem tests and it seems RAM works properly. Cheers!

YungKaymak
  • 11