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Apple Computing Products:
macOS - Operating System
OSX RAM limit?
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<blockquote data-quote="werby" data-source="post: 31989"><p>Well, I did, and this is what I got:</p><p>"The _machine_ (running in 64 bit mode) is capable of accessing up to 4 TB of RAM, but a process running on MacOSX (which only supports 32bit addressing - 1 bit for user vs. OS address space) can only access 2GB. </p><p></p><p>In other words, the G5, with its 64bit register file(s) and instruction set certainly supports direct addressing of all 8GB in the machine (up to the VM limit which I've forgotten now). But in order for a process running on an OS running on the G5 to access all 8GB, that OS would have to provide an address _larger_ than 32bits in size and the process would have to be compiled to take advantage of that."</p><p></p><p>SOOOoooo... there ya have it: 2GB Ram limit. CONFIRMED!</p></blockquote><p></p>
[QUOTE="werby, post: 31989"] Well, I did, and this is what I got: "The _machine_ (running in 64 bit mode) is capable of accessing up to 4 TB of RAM, but a process running on MacOSX (which only supports 32bit addressing - 1 bit for user vs. OS address space) can only access 2GB. In other words, the G5, with its 64bit register file(s) and instruction set certainly supports direct addressing of all 8GB in the machine (up to the VM limit which I've forgotten now). But in order for a process running on an OS running on the G5 to access all 8GB, that OS would have to provide an address _larger_ than 32bits in size and the process would have to be compiled to take advantage of that." SOOOoooo... there ya have it: 2GB Ram limit. CONFIRMED! [/QUOTE]
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Apple Computing Products:
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OSX RAM limit?
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