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Is 128 GB RAM supported in Mac OS X Mountain Lion ?

S

Spacedust

macrumors 65816
Original poster
May 24, 2009
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I know that 96 GB was supported in Lion. How about Mountain Lion ?
 
I remember reading somewhere that ML was tested to support 128gb, but only shows 96gb in about this mac and the like. In activity monitor, though, 128gb showed up and was accessible.

Others will chime in.
 
papoopeepoo said:
I remember reading somewhere that ML was tested to support 128gb, but only shows 96gb in about this mac and the like. In activity monitor, though, 128gb showed up and was accessible.

Others will chime in.
Click to expand...

In my test it was almost the opposite. In about this Mac 128 GB shows up, but in activity monitor only 96 is reported. Then when I ran a program that I knew would try to use 128, it could not. I suppose activity monitor may not be reporting usage above 96 GB, but what else can you do?
 
wallysb01 said:
In my test it was almost the opposite. In about this Mac 128 GB shows up, but in activity monitor only 96 is reported. Then when I ran a program that I knew would try to use 128, it could not. I suppose activity monitor may not be reporting usage above 96 GB, but what else can you do?
Click to expand...

Got it now, thanks.
 
Thank you. I just wanted to know ;)

Windows Vista Business/Ultimate supports up to 128 GB RAM
Windows 7 Professional/Ultimate supports up to 192 GB RAM
Windows 8 consumer preview supports up to 512 GB RAM :)
 
Tutor said:
Then why would OWC be selling 128 GB for the Mac Pro if the excess above 96 is not usable? http://eshop.macsales.com/shop/memory/Mac-Pro-Memory Give them a call.
Click to expand...

Says right below: **Current Mac OS X versions are unable to utilize more then 96GB RAM due to an operating system limitation. 128GB can be fully utilized by a 2009-2010 Mac Pro if running Bootcamp with 64-bit versions of Windows XP and later as well as with 64-bit versions of Linux.
 
Spacedust said:
Thank you. I just wanted to know ;)

Windows Vista Business/Ultimate supports up to 128 GB RAM
Windows 7 Professional/Ultimate supports up to 192 GB RAM
Windows 8 consumer preview supports up to 512 GB RAM :)
Click to expand...

That's interesting. I wonder why they just din't set the limit at 999 Exabytes or some other ridiculous amount and avoid issues? It's not like they are unaware that capabilities of hardware increase all the time.
 
velocityg4 said:
That's interesting. I wonder why they just din't set the limit at 999 Exabytes or some other ridiculous amount and avoid issues? It's not like they are unaware that capabilities of hardware increase all the time.
Click to expand...

Because they can't properly test it and develop around it.
 
The amount of RAM that the OS can support is irrelevant at this point. The concern is really what one's logic board can support.
 
mackid1993 said:
The amount of RAM that the OS can support is irrelevant at this point. The concern is really what one's logic board can support.
Click to expand...

Except this is patently not true on a Mac Pro, where running Windows 64-bit or Linux you can get access to 128 GB of RAM, but OS X will top out at 96.
 
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