4GB Macbook Memory

eyebeaz

macrumors 6502
Oct 22, 2006
250
1
First generation Macbooks will only address 2 GB. C2D Macbooks will address 3GB, athlough it is not recommended by Apple.
 

chex

macrumors regular
May 17, 2007
221
0
it isn't 'not recommended' - they don't even mention it

they don't offer it because they only give dual channel specifications - probably to help along the integrated gpu
 

eyebeaz

macrumors 6502
Oct 22, 2006
250
1
it isn't 'not recommended' - they don't even mention it

they don't offer it because they only give dual channel specifications - probably to help along the integrated gpu
Exactly.. not using dual channel puts strain on the GPU or something along those lines.
 

chex

macrumors regular
May 17, 2007
221
0
Exactly.. not using dual channel puts strain on the GPU or something along those lines.
er, no

not using dual channel makes it ever so slightly responsive, which slows down the crappy gpu even more.

if you are not going to be running games or 3D apps then 3GB is better than 2GB
 

dex22

macrumors regular
Jun 17, 2003
248
0
Round Rock, TX
As a person with a 4GB Macbook C2D, here's the deal. 4GB gives either 3GB or 3.3GB available, depending on model of C2D, and 2GB max on a CD macbook.

Using 4GB maintains your ability to use dual channel, which gives you the same speed as using 2GB or 1GB matched pairs. 3GB works great, but as a non-matched pair, you lose dual channel support. This slows the entire machine down by 10% or so, and has a noticable but not crippling impact on video performance.

I chose 4GB instead of 3GB because it was only $40 more and I figured in the future it would sell better as a matched pair, or could be swapped into a future macbook or pro.

Ok, I'm off to Sams Club to see if they have any cool gadgets for my macbook :)
 

LeftoverCrack

macrumors member
Jan 2, 2008
44
0
new? if its newer than november that means that it is a santa rose machine, it uses all 4gb. it would say 3.3gb if it didn't use it all im pretty sure.
 

jowie

macrumors 6502a
Jun 9, 2004
571
8
London ish
new? if its newer than november that means that it is a santa rose machine, it uses all 4gb. it would say 3.3gb if it didn't use it all im pretty sure.
Yes it was bought around Christmas time. So are there three types of machine: Core Duo, Core 2 Duo and now Santa Rosa Core 2 Duo?
:confused:
Why is a huge chunk of it under "inactive"? Does anyone know what inactive really means?
 

ayeying

macrumors 601
Dec 5, 2007
4,547
11
Yay Area, CA
First Gen are Core Duo, no, you can only get upto 2GB. 3GB might be possible but its a chipset restriction here... actually, i'm not sure for this gen. if someone can get the chipset number/model... you can look it up on intel.com and see if you can put in 4 GB or not.

Second Gen are Core 2 Duo, (1.83GHz/2.0GHz) can use 4GB, but you can only address upto 3 GB.

Third Gen are also Core 2 Duo, (2.0GHz/2.16GHz), same as 2nd Gen but I think you can address upto 3.25GB (not sure about that)

Forth Gen, Core 2 Duo again (2.0GHz/2.2GHz), current, can use 4GB AND address 4GB if you have a x64 OS (Doesn't matter for OSX since its 32/64bit). This gen is also using the Santa Rosa chipset.

Inactive memory are, according to apple: "This information is no longer being used and has been cached to disk, but it will remain in RAM until another application needs the space. Leaving this information in RAM is to your advantage if you (or a client of your computer) come back to it later."

http://docs.info.apple.com/article.html?artnum=107918
 

kle

macrumors newbie
Apr 19, 2008
2
0
Question! RAM Problem!

Hi Guys,
I read all the previous entrys but I still can't solve my problem.

I use a Macbook with 2.16Ghz C2D bought August 2007.
I upgraded my memory from 2gb 667Mhz to 4GB 667Mhz
(2 Moduls) this week.

System Info now shows me that the Ram is only running @ 533Mhz speed!
Can anyone tell me why that is? There's nothing wrong with the moduls. I checked them in combination with the old 1GB moduls.

In combination as 2GB and 1GB modul they run @ 667Mhz!?!


I'd appreciate any help or Info.
 

aquajet

macrumors 68020
Feb 12, 2005
2,383
0
VA
First Gen are Core Duo, no, you can only get upto 2GB. 3GB might be possible but its a chipset restriction here... actually, i'm not sure for this gen. if someone can get the chipset number/model... you can look it up on intel.com and see if you can put in 4 GB or not.
The Core Duo machines can only use a max. of 2 gb. This has been established for a number of years now.

Hi Guys,
I read all the previous entrys but I still can't solve my problem.

I use a Macbook with 2.16Ghz C2D bought August 2007.
I upgraded my memory from 2gb 667Mhz to 4GB 667Mhz
(2 Moduls) this week.

System Info now shows me that the Ram is only running @ 533Mhz speed!
Can anyone tell me why that is? There's nothing wrong with the moduls. I checked them in combination with the old 1GB moduls.

In combination as 2GB and 1GB modul they run @ 667Mhz!?!


I'd appreciate any help or Info.
Bring the RAM back to the store. It is the wrong type. If your machine is reporting that your RAM is 533 mhz, it's because the RAM is actually 533 mhz, not 667.
 

kle

macrumors newbie
Apr 19, 2008
2
0
Thanx

Thanx for the reply,

My C2D can handle a total of 3.35Ghz as I checked on Acticity Monitor.
You're right there must be something wrong with the RAM. Tried everything else. I'll change them against 2 new Moduls in the shop tomorrow.

Tell u if it worked.

Best greez from Munich
and a nice weekend (@21°C here)

Kle
 
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