Greetings.
I own a Mac Pro 2,1 running macOS 10.11 El Capitan (the latest available version of macOS that can boot with patches on 32-bit EFI) as well as a Microsoft Windows 10 Professional installation (using a patched W10 install DVD for booting on the BIOS mode of the EFI).
The system has 14GB of RAM installed over the two RAM cards; 4x2GB on card 1 and 2x2GB + 2x1GB on card 2.
The system also has an ATI Radeon HD 5700 GPU with 1024MB dedicated memory. So far so good.
On macOS, the "Memory" tab of the System Information properly reports all 14GB RAM sticks, all recognized, as well as 1024MB of video memory for the graphics card in the System Report.
However, on Windows 10, the 14GB of RAM are detected but only 7.99GB are marked as usable by the system, with the remaining memory being Hardware reserved.
Because of this, I decided to take a look at the "Display" tab of my friend DxDiag.
From what I have understood, the Shared Memory for the GPU corresponds to the amount of system RAM Windows can allocate to the graphics card if its dedicated video RAM is full, and is only used when needed; otherwise, it is available as system RAM. Here, we can see that we have 3840MB Shared Memory, and thus way less than the memory that is supposedly reserved by hardware.
From that, I believe that it means I only have 8GB of RAM available, and the Shared Memory above is actually applied to the 8GB system RAM and not the Hardware Reserved one.
This essentially means I have 6350MB of dead RAM.
I attempted reseating the RAM, as well as invert the RAM cards. It actually turns out that the RAM from the slot 1 of the Mac Pro is the only one that will be provided for Windows, whereas the second's goes reserved. When I installed the 6GB RAM card in the first slot and the 8GB card in the second slot, I had 6GB System RAM and 8GB Reserved Memory.
This is clearly not a normal behavior. Regardless of the RAM positioning, all of it remains available in macOS also, without error.
Resetting the NVRAM did not change anything, and the SMC has also been reset several times since I unplugged and discharged the system when reseating the memory modules.
I'm kinda at a loss here. I know there are many "Apple pros" here, and thus I come here to request some assistance.
Thanks in advance.
I own a Mac Pro 2,1 running macOS 10.11 El Capitan (the latest available version of macOS that can boot with patches on 32-bit EFI) as well as a Microsoft Windows 10 Professional installation (using a patched W10 install DVD for booting on the BIOS mode of the EFI).
The system has 14GB of RAM installed over the two RAM cards; 4x2GB on card 1 and 2x2GB + 2x1GB on card 2.
The system also has an ATI Radeon HD 5700 GPU with 1024MB dedicated memory. So far so good.
On macOS, the "Memory" tab of the System Information properly reports all 14GB RAM sticks, all recognized, as well as 1024MB of video memory for the graphics card in the System Report.
However, on Windows 10, the 14GB of RAM are detected but only 7.99GB are marked as usable by the system, with the remaining memory being Hardware reserved.
Because of this, I decided to take a look at the "Display" tab of my friend DxDiag.
From what I have understood, the Shared Memory for the GPU corresponds to the amount of system RAM Windows can allocate to the graphics card if its dedicated video RAM is full, and is only used when needed; otherwise, it is available as system RAM. Here, we can see that we have 3840MB Shared Memory, and thus way less than the memory that is supposedly reserved by hardware.
From that, I believe that it means I only have 8GB of RAM available, and the Shared Memory above is actually applied to the 8GB system RAM and not the Hardware Reserved one.
This essentially means I have 6350MB of dead RAM.
I attempted reseating the RAM, as well as invert the RAM cards. It actually turns out that the RAM from the slot 1 of the Mac Pro is the only one that will be provided for Windows, whereas the second's goes reserved. When I installed the 6GB RAM card in the first slot and the 8GB card in the second slot, I had 6GB System RAM and 8GB Reserved Memory.
This is clearly not a normal behavior. Regardless of the RAM positioning, all of it remains available in macOS also, without error.
Resetting the NVRAM did not change anything, and the SMC has also been reset several times since I unplugged and discharged the system when reseating the memory modules.
I'm kinda at a loss here. I know there are many "Apple pros" here, and thus I come here to request some assistance.
Thanks in advance.