New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

iMac - Why 3Gb memory limit in 20" & 24" iMac's?


Post Reply New Thread Subscribe

 
Thread Tools
ItsMeDave

 
Member Since: Apr 12, 2007
Location: Vancouver, BC
Posts: 101
ItsMeDave is on a distinguished road
Mac Specs: 2.16Ghz Core2Due 20" iMac - 2Gb RAM - wireless Mac KB - wireless MX610 mouse

ItsMeDave is offline
Hi Everyone,

Isn't it optimal to have matched banks of memory?
My 20" iMac came with 2 512Mb SIMMs which were upgraded to two 1Gb SIMMs. Would a third SIMM perform as well as the matched set?

cheers
QUOTE Thanks
narf1899

 
narf1899's Avatar
 
Member Since: Feb 05, 2007
Posts: 465
narf1899 is a jewel in the roughnarf1899 is a jewel in the rough
Mac Specs: iMac 20" C2D 2.4 ghz 2gb iMac 20" C2D 2GB 256MB Graphics Macbook C2D 2GB Powermac G4 Dual 450

narf1899 is offline
i believe that the imac can support 4gb (dual 2gb modules)....someone correct me if im wrong

iMac Aluminum 20" 2.4 ghz 2gb RAM 300gb HD
iMac 20" Core2duo 2gb 250gb
Macbook White Core2duo 2gb 80gb
Powermac G4 dual 450
QUOTE Thanks
ItsMeDave

 
Member Since: Apr 12, 2007
Location: Vancouver, BC
Posts: 101
ItsMeDave is on a distinguished road
Mac Specs: 2.16Ghz Core2Due 20" iMac - 2Gb RAM - wireless Mac KB - wireless MX610 mouse

ItsMeDave is offline
This is straight off the Apple website:

17-inch model with 2.0GHz processor, 20-inch and 24-inch models

* 1GB (2x512MB) of PC2-5300 (667MHz) DDR2 memory
* Two SODIMM slots support up to 3GB
QUOTE Thanks
narf1899

 
narf1899's Avatar
 
Member Since: Feb 05, 2007
Posts: 465
narf1899 is a jewel in the roughnarf1899 is a jewel in the rough
Mac Specs: iMac 20" C2D 2.4 ghz 2gb iMac 20" C2D 2GB 256MB Graphics Macbook C2D 2GB Powermac G4 Dual 450

narf1899 is offline
yes they say that, but they also say macbooks can support 2 gb, when its proven they can actually support 3gb.

iMac Aluminum 20" 2.4 ghz 2gb RAM 300gb HD
iMac 20" Core2duo 2gb 250gb
Macbook White Core2duo 2gb 80gb
Powermac G4 dual 450
QUOTE Thanks
gilesjuk

 
gilesjuk's Avatar
 
Member Since: Apr 03, 2007
Posts: 301
gilesjuk has a spectacular aura about
Mac Specs: Black MacBook 2GB, Mac Pro 2.66Ghz 3GB X1900.

gilesjuk is offline
You can use either 2 x 2GB or 1 x 1GB and 1 x 2GB. But for some reason the max is 3GB. Most standard PCs only address 4GB anyway, the OS can work around it though, you get the option of highmem in Linux.
QUOTE Thanks
Benjamindaines

 
Benjamindaines's Avatar
 
Member Since: Jan 08, 2005
Location: A religiously oppressed state
Posts: 2,822
Benjamindaines is just really niceBenjamindaines is just really niceBenjamindaines is just really niceBenjamindaines is just really niceBenjamindaines is just really nice
Mac Specs: 17" MacBook Pro

Benjamindaines is offline
Quote:
Originally Posted by gilesjuk View Post
But for some reason the max is 3GB.
It's the Intel chipset. The C2Ds can only use 3GB before you get what they call memory overlapping (basically things get stored more than once, so why bother with the extra gig if it's just going to be wasted anyway).
Quote:
Originally Posted by narf1899 View Post
i believe that the imac can support 4gb (dual 2gb modules)....someone correct me if im wrong
You are wrong :p

QUOTE Thanks
ItsMeDave

 
Member Since: Apr 12, 2007
Location: Vancouver, BC
Posts: 101
ItsMeDave is on a distinguished road
Mac Specs: 2.16Ghz Core2Due 20" iMac - 2Gb RAM - wireless Mac KB - wireless MX610 mouse

ItsMeDave is offline
Thanks for the info folks. :-)

Question, how many people have 3Gb RAM in their iMac?
QUOTE Thanks
gilesjuk

 
gilesjuk's Avatar
 
Member Since: Apr 03, 2007
Posts: 301
gilesjuk has a spectacular aura about
Mac Specs: Black MacBook 2GB, Mac Pro 2.66Ghz 3GB X1900.

gilesjuk is offline
Quote:
Originally Posted by ItsMeDave View Post
Thanks for the info folks. :-)

Question, how many people have 3Gb RAM in their iMac?
Not yet, but I will replace the 1GB module with a 2GB soon. My iMac came with 2GB installed and I was expecting 1GB, so I had already planned on buying RAM.

With Linux I managed to edit Canon 5D RAW files on my laptop which only has 512MB. So I would imagine you only need 3GB if you are editing huge files, or need to have a few open at once.
QUOTE Thanks
ItsMeDave

 
Member Since: Apr 12, 2007
Location: Vancouver, BC
Posts: 101
ItsMeDave is on a distinguished road
Mac Specs: 2.16Ghz Core2Due 20" iMac - 2Gb RAM - wireless Mac KB - wireless MX610 mouse

ItsMeDave is offline
Do you recommend sticking with the same brand of memory?
QUOTE Thanks

Post Reply New Thread Subscribe


« dual keyboard question | Can't Install/Un-Install Program »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
Screen brightness in 24" vs. other imacs jeffk27 Apple Desktops 10 12-18-2006 08:31 PM
1GB memory for Intel 20" imac Canadianapex Apple Desktops 5 08-10-2006 03:16 PM
Why Apple recommends matched pair memory bigbadandugly Apple Desktops 5 04-08-2006 02:41 PM
Will Geil brand of memory fit in the Intel iMacs?? VakeJ Apple Desktops 1 03-20-2006 03:15 AM
cas 2 memory in imacs (g5)??? coho Apple Desktops 4 11-20-2005 06:52 PM

All times are GMT -4. The time now is 03:38 PM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?