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Memory Interleaving
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Addicted to MacNN
Join Date: Jan 2000
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So I read that you can upgrade your MacBook memory slots individually, BUT if you match them up you'll get better performance. What kind of performance are we talking about? 512mb is NOT cutting it, but a gig right now goes for $160. Plus after the upgrade i'll be left with a pair of 256's that I probably won't be able to give away, let alone sell. I still have a pair of 256 DIMMs from a G5 that I was unable to sell on ebay for $5.
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Posting Junkie
Join Date: Oct 2005
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2 identical memory modules give you twice the bandwidth of 1 module or 2 unmatched modules. Since graphics performance is usually very sensitive to graphics memory speed, and the MacBook has integrated graphics, you really want to stay with dual channel.
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Mac Elite
Join Date: Mar 2006
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Originally Posted by mduell 
2 identical memory modules give you twice the bandwidth of 1 module or 2 unmatched modules. Since graphics performance is usually very sensitive to graphics memory speed, and the MacBook has integrated graphics, you really want to stay with dual channel.
Doesn't the MB support assymettric dual-channel?
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Posting Junkie
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Originally Posted by Tuoder
Doesn't the MB support assymettric dual-channel?
Yes, but unfortunately that doesn't mean what you think it means.
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Mac Elite
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Originally Posted by mduell
Yes, but unfortunately that doesn't mean what you think it means.
What do I think that means, and what does it mean?
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Posting Junkie
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Originally Posted by Tuoder
What do I think that means, and what does it mean?
You seem to think it means that you get the same dual-channel performance with 2 unmatched modules (asymmetric) as you would with 2 matched modules (symmetric).
What it means is that the computer will run with 2 unmatched modules, but you only get single-channel performance.
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Mac Elite
Join Date: Mar 2006
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Originally Posted by mduell
You seem to think it means that you get the same dual-channel performance with 2 unmatched modules (asymmetric) as you would with 2 matched modules (symmetric).
What it means is that the computer will run with 2 unmatched modules, but you only get single-channel performance.
It is my understanding of the situation that you do not get all of the performance of a matched-pair set up when unmatched pairs are used. But, it is still not as bad as single channel.
When I built my P4 PC, I had to buy matched pairs for dual channel use, if I did not, they operated as a single channel.
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Professional Poster
Join Date: May 2001
Location: Hampton Roads, VA
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Originally Posted by l008com
So I read that you can upgrade your MacBook memory slots individually, BUT if you match them up you'll get better performance. What kind of performance are we talking about? 512mb is NOT cutting it, but a gig right now goes for $160. Plus after the upgrade i'll be left with a pair of 256's that I probably won't be able to give away, let alone sell. I still have a pair of 256 DIMMs from a G5 that I was unable to sell on ebay for $5.
A gig (2 512mb sticks) can be had for around $100, and 2 gigs (2 1gb sticks) can be had for right around $200. ramseeker
(Last edited by jokell82; Nov 4, 2006 at 11:07 PM.
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All glory to the hypnotoad.
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Addicted to MacNN
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the prices you quote aren't anywhere near the prices on the page you linked to.
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Professional Poster
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No?
Am I misreading the very top line?
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Senior User
Join Date: Mar 2001
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I found genuine Kingston DDR2 667 at less than $100 per gigabyte stick. You just need to know where to look.
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Addicted to MacNN
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No thats just not the same link. Also I wouldn't be caught dead putting 1-800-4-memory ram in the same room as one of my computers. I don't do cheap ram, I do crucial guaranteed for life ram.
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Professional Poster
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Originally Posted by l008com
No thats just not the same link. Also I wouldn't be caught dead putting 1-800-4-memory ram in the same room as one of my computers. I don't do cheap ram, I do crucial guaranteed for life ram.
How is that not the same link? Go to ramseeker and select "MacBook" from the drop down and you get that list. It doesn't take a rocket scientist....
And I'm glad you choose over-priced ram for your machines. Some of us don't feel the need to waste our money.
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