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4 gigs of RAM in a Core Duo MacBook?
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Professional Poster
Join Date: Jul 2005
Location: Winnipeg, MB
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I got a Core Duo MacBook, bought two 2 gig DIMMs, turns out they don't work... I'm wondering if it's just cheap/bad RAM or if for some reason my MacBook can't take more than 3 like Apple-history says, I figured it was just a limit Apple said it had but they just went with what was economical at the time.
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Professional Poster
Join Date: Sep 2005
Location: Rochester, NY
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If it's one of these, then it can only take a maximum of 2 GB (1 in each slot).
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Dedicated MacNNer
Join Date: Jan 2007
Location: Oakland, CA
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Macbook Core Duo limit = 2 GB
MacBook Core 2 Duo until Nov 2007= 3 GB
MacBook Core 2 Duo presently = 4 GB
Why? Chipset.
Solution for OP? Return purchase or exchange for a 2 GB kit (2x1GB)
Lesson learned? Apple can say some arbitrary things, like that the first C2D MB could only handle 2 GB, but sometimes they are not making things up, as in this case. Do research before you buy, it is as simple as wikipedia: MacBook - Wikipedia, the free encyclopedia
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17" MBP C2D 2.33/3 GB RAM/500 GB 7200 rpm/Glossy Display|-|
17" iMac CD|-|15" PB G4 1.25 GHz|-|iBook g4 1Ghz|-|Pismo
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Originally Posted by tinkered 
Macbook Core Duo limit = 2 GB
MacBook Core 2 Duo until Nov 2007= 3 GB
MacBook Core 2 Duo presently = 4 GB
Why? Chipset.
In the Core Duo case, it's Apple's crippled firmware. The chipset (945 mobile) supports 4GB physical/3GB addressable, but Macs are limited to 2GB.
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Dedicated MacNNer
Join Date: Jan 2007
Location: Oakland, CA
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Originally Posted by mduell
In the Core Duo case, it's Apple's crippled firmware. The chipset (945 mobile) supports 4GB physical/3GB addressable, but Macs are limited to 2GB.
True, thanks for elaborating.
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17" MBP C2D 2.33/3 GB RAM/500 GB 7200 rpm/Glossy Display|-|
17" iMac CD|-|15" PB G4 1.25 GHz|-|iBook g4 1Ghz|-|Pismo
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Fresh-Faced Recruit
Join Date: Jan 2008
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Originally Posted by mduell
In the Core Duo case, it's Apple's crippled firmware. The chipset (945 mobile) supports 4GB physical/3GB addressable, but Macs are limited to 2GB.
I have a core duo 2, with 4gigs ram. When I look at about this mac it says 4 gb 667 mhz ddr2 sdram, but when I look in the activity monitor it says 3.00gb total.
Is this the firmware limitation and thus i really don't have 4 gigs available?
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Moderator  Join Date: Oct 2001
Location: San Jose, CA
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Originally Posted by ottoreck
I have a core duo 2, with 4gigs ram. When I look at about this mac it says 4 gb 667 mhz ddr2 sdram, but when I look in the activity monitor it says 3.00gb total.
Is this the firmware limitation and thus i really don't have 4 gigs available?
Yes, the first C2D machines had the 3 GB limitation as well.
Steve
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Celebrating 10 years and 4000 posts on MacNN!
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
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There is a sticky thread that already answers all these question. Could we have a lock here please?
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