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Is it better to install DDR2 in identical pairs?
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Professional Poster
Join Date: Mar 2003
Location: In the South
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I know it i better to have 2 sticks. But I have the stock 512 in my 20" 2.1 GHz iMac. I wanna buy a gig. Am I getting the maximum performance from the new gig?
Naturally, it would be even better to have 2 -1 GB sticks, but, is the performance just 1 upgrade hindered by the existing 512?
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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The 2.1Ghz model has the 512MB soldered on-board and only one slot, so you really don't have a choice.
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Dedicated MacNNer
Join Date: Jan 2006
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yeah, NewEgg feedback talks about this with the cheaper Mac memory. If the other one is soldered in you may want to pay extra and just get Crucial memory (matches what you have?).
Some of the cheaper stuff is pricky and the price of memory is high right now (and I thought I paid a lot at $160 for 1GB for Crucial)
iMac Core Duo used Crucial memory OEM. Unsure about the soldered in thing = see what others are using. Matching memory may not matter much with one soldered in.
When you had slots and banks it did matter that the banks had matching memory (and were full), but you don't have this anymore = they are each their own slot.
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Matching brands doesn't really matter. If the iMac G5 memory controller supports dual channel (I don't know if it does or doesn't), he'd need to match capacity, speed, and latency in the second slot.
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Professional Poster
Join Date: Mar 2003
Location: In the South
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Originally Posted by mduell
The 2.1Ghz model has the 512MB soldered on-board and only one slot, so you really don't have a choice.
Oh. Well that splains that. I've never had a Mac where they did that, so I just assumed. 
Well, since the max is 2 GB, I guess, I just get the one 1GB.
Looked at New Egg and crucial. Can I assume the one in there is:
240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) System Memory - OEM
New egg has the crucial for less than them, plus I need a trackball, so I guess I'm good to go if I am matching what mduell said.
Thanks.
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Professional Poster
Join Date: Mar 2003
Location: In the South
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OK, I just read I can have 2.5 GB. But since I can only put one I looked at the 2GB. MY GAWD! Lil price difference!
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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Originally Posted by KeriVit
Oh. Well that splains that. I've never had a Mac where they did that, so I just assumed.
Well, since the max is 2 GB, I guess, I just get the one 1GB.
Looked at New Egg and crucial. Can I assume the one in there is:
240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) System Memory - OEM
New egg has the crucial for less than them, plus I need a trackball, so I guess I'm good to go if I am matching what mduell said.
You only need DDR2-533/PC2-4200 for your iMac, so unless -667 is cheaper due to volume you may as well buy the slower speed. The iMac won't go any faster with -667 than -533.
Yes, 2GB modules have quite a price premium compared to 1GB at the moment.
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