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3GB RAM limit on MPB C2D?
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Mac Enthusiast
Join Date: Mar 2001
Location: boston
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Hi,
As an experiement, I put 2 2GB DIMM's in my 2.16ghz MBP C2d. The system profiler reports 4GB of RAM. Does this mean that the machine is capable of addressing all 4GB or will it only address 3GB?
I thought these machines had an upper limit of only 3GB.
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Clinically Insane
Join Date: Dec 1999
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Good question. I don't know.
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"…I contend that we are both atheists. I just believe in one fewer god than
you do. When you understand why you dismiss all the other possible gods,
you will understand why I dismiss yours." - Stephen F. Roberts
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Addicted to MacNN
Join Date: Mar 2006
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What does activity monitor say? Apple has a history of making machines that can actually accept more than is marketed sometimes.
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Mac Elite
Join Date: Mar 2004
Location: Truckee, CA
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No, the chipset limits to ~3 GB.
-Allen Wicks
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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945PM physically supports 4GB RAM. Due to addressing issues, you can only use about 3.4GB of it. But as far as I know, Apple arbitrarily sets a 3GB limit (2GB on Core Duo Macs).
What does Activity Monitor show for memory?
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Mac Enthusiast
Join Date: Mar 2001
Location: boston
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'doh, Activity Monitor shows 3GB.
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
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Originally Posted by SierraDragon 
No, the chipset limits to ~3 GB.
The chipset limits to 4 GB physically. But software can only address about 3.2 GB.
The 3 GB limit is advertised by Apple to prevent people from wasting money. You can of course put 4GB in there if you buy a second 2 GB DIMM from another vendor.
Santa Rosa will not have this "addressing waste" and allow you to use the entire 4 GB.
There's a lot of baloney being spread about the 3 GB RAM limit. A while ago Rolling Musubi wrote a nice post with some very interesting links on the topic.
(Last edited by Simon; May 8, 2007 at 03:06 AM.
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