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g5 16 gig memory?
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Junior Member
Join Date: Aug 2004
Location: santa clarita/beverly hills
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Hi..if i were to put 2 gigabite memory cards in my g5 instead of 1 gigabite memory cards, could the computer run on 16 gigs of memory? since i have the rev b dual 1.8...could i put four 2 gig cards in my computer and have 8 gigs of ram? although there arent 4 dimm slots, the computer can handle up to 8 gigs of ram (i heard it can also handle 16) ...?
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Powermac G5, Dual 1.8 8x superdrive, 250 gig startup drive 80 gig seconday drive, nvidia 6800 gt, logitech z-5500
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Mac Elite
Join Date: May 2004
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Why would you want 16 GB of DDR RAM in your G5 ? Isn't that a little over the top, and completely useless ? Most apps dont read beyond 2 GB ... (based on what I've read here on MacNN)
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stuffing feathers up your b*tt doesn't make you a chicken.
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Junior Member
Join Date: Aug 2003
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I'm pretty certain you can and OS X will recognise all the memory. However i doubt Apple supports it and you'd want to be certain that the memory is good to use with Mac's.
The memory controller in G5's supports 48bit (i think) addressing. That something like 32TB of memory so I don't think there'd be a problem there.
So yes I am pretty certain that for a ridiculous price 4 slot G5's can support 8GB and 8 slots can support 16GB.
Of course I could also be very wrong. I suggest just trying it first.
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Forum Regular
Join Date: Jun 2001
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Originally posted by d.fine:
Why would you want 16 GB of DDR RAM in your G5 ? Isn't that a little over the top, and completely useless ? Most apps dont read beyond 2 GB ... (based on what I've read here on MacNN)
In 10.3, no app can use more than 2GB. Each program is given a 32-bit virtual address space. In 10.4, you can compile it so that the app will receive a bigger address space, but I don't know the limit (I doubt it's 42 though).
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"It's not like Windows users don't have any power. I think a lot of people are happy with Windows, and that's an incredibly depressing thought." -Steve Jobs
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Moderator
Join Date: May 2001
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Originally posted by discstickers:
In 10.3, no app can use more than 2GB. Each program is given a 32-bit virtual address space. In 10.4, you can compile it so that the app will receive a bigger address space, but I don't know the limit (I doubt it's 42 though).
Well, it doesn't matter. BFS (file system of BeOS supported full 64 bit addressing. I don't think it makes much difference to implement even though you will probably stay below the barrier.
My guesstimate is that the G5 towers can handle 16 GB physically, but I have no way to verify that. Apart from that, I think it's just an academic question up till now.
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I don't suffer from insanity, I enjoy every minute of it.
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Join Date: Sep 2004
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I don't think 48-bit addressing handles 32TB of physical memory, but rather 32TB of virtual memory. I'm under the impression that a 64-bit addressing system supports up to 8GB of RAM.
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Moderator
Join Date: May 2001
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I don't know about this, but with Panther, as mentioned before, it's not very useful to have that much RAM anyway. How can you check with Tiger?
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I don't suffer from insanity, I enjoy every minute of it.
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Mac Elite
Join Date: Oct 2003
Location: New York City, NY
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when will you ever use 8 100% processor intensive programs at one given time? must be one hell of a multi tasker.
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iamwhor3hay
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Junior Member
Join Date: Aug 2003
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Actually a 64bit addressing system can support several exobytes of ram but the Northbridge chip on the G5's is only (I think) 42 bit.
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Professional Poster
Join Date: Mar 2002
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16 GB of RAM cost an arm and a leg.
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Senior User
Join Date: Mar 1999
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16GB of RAM is possible via 2GB sticks according to the hardware dev notes.
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Posting Junkie
Join Date: Jun 2003
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Originally posted by discstickers:
In 10.3, no app can use more than 2GB.
4 GB.
Also, you can run multiple apps simultaneously that can access that much memory.
Originally posted by oeyvind:
16GB of RAM is possible via 2GB sticks according to the hardware dev notes.
Correct. Apple itself says 16 GB will work.
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Senior User
Join Date: Oct 2004
Location: Portugal
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Anyone care to try?
Now seriously, that'll be a great experiment, but I doubt 16GB are needed at this point...
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