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New 1GB, 1.5GB PC133 RAM & G4's
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Junior Member
Join Date: Dec 2002
Location: Philadelphia
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If you put these larger RAM modules into the older (PC133) G4's, can you get over 2GB usable RAM?
(ohh...6GB RAM (its so cheap now...) in the 4 slots?!)
I think OS9 ignores RAM over 1.75, but OSX has no limit, right?
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Registered User
Join Date: Mar 2002
Location: Europe
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I don't think so, but you could always try 
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Addicted to MacNN
Join Date: Oct 2001
Location: BFE
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1GB's and above won't work. It either won't see more than 512MB or it won't work at all.
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I'm a bird. I am the 1% (of pets).
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Moderator Emeritus  Join Date: Dec 2000
Location: College Park, MD
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Originally posted by spiznet:
If you put these larger RAM modules into the older (PC133) G4's, can you get over 2GB usable RAM?
(ohh...6GB RAM (its so cheap now...) in the 4 slots?!)
I think OS9 ignores RAM over 1.75, but OSX has no limit, right?
Nope. Will not work. 4GB is a processor limit, and 2GB is the max that any mac will take, 4 slots with 512MB.
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Administrator  Join Date: May 2000
Location: California
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512 modules appear to be the maximum size the memory controller can address. If it could recognize larger modules, the system would ultimately be limited to 4 GB. This is the memory addressing limit of the 7400/7410 - 32 bit memory address space.
The 745x used in later PowerMacs has a 36 bit memory address space. If the motherboard supported it, they could go to 64 GB.
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