64gb RAM not compatible in High Sierra

[crossmiles8]

Hey there,

I've got an early 2008 mac pro 3,1. Running OS X High Sierra using Dosdude patch. Upgraded to 64gb of RAM but get stuck on boot screen. Pulled out 2 of the 8gb DIMMs and replaced with 4gb's (64gb total down to 56gb) and all is fine. What gives? Any work around? Thanks guys.

 

[TheSkywalker77]

Did you buy the RAM exclusively for your device? And does it say 64 GB is supported for that device?

 

[crossmiles8]

Yeah the RAM is fine, works okay in previous OS Versions. Just High Sierra has the issue, very strange. It's specific to the OS itself.

 

[titaniumjones]

That is interesting.
I have an xServe 3.1 (Basically the same machine) but only on Sierra. I'm glad I've not upgraded yet.
I hope someone has an answer.
I suspect that Apple has put a software limit in, to limit the ability to install it on 'Unsupported' Macs.