Apple Event: May 7th at 7 am PT
I undertstand most of the issues of 3GB vs 4GB installed in this computer, as explained very well here:
With two 2GB chips, the computer might recognize just 3GB.
But is their any dual-channel advantage by installing a matched pair (two 2GB), instead of one 2Gb and one 1GB?
MacBook Pro, 2.16GHz Intel Core 2 Duo 15.4"
LambdaEnt wrote:
With two 2GB chips, the computer might recognize just 3GB.
The computer recognizes 3.5GB is what I understand, or else why bother and just use a 2GB + 1GB right?
I think the article is trying to say is there is a problem with memory overlap when one uses 2 - 2GB for 3.5GB and that they would be better off using 2GB + 1GB for 3GB to avoid the overlap.
However one would lost the .5GB and have to swap slightly more often to storage.
The older 32 bit Mac's, if you have a 7,200 RM drive (or splurge for a small SSD) then the swap is faster, so 3GB + a fast storage would likely be better than having memory overlap with 3.5GB.
I replaced my older 15" with a 7,200 RPM and 4GB of RAM and the performance improved greatly, I really didn't have any problems until I install OS X Lion on it and that killed it deader than a doornail.
That's all nice, but had nothing to do with my question.
There are advantages to matching pairs, buy 2x2G.
I'm sorry, I just re-read your reply. The question was regarding dual-channel. But overall, it was about performance.
When you upgraded to Lion, did you run Lion Cache Cleaner?
I have found ANY OSX upgrade always suffers serious performance decreases. LCC solves the issues.
MacBook Pro 2,2 and 4GB RAM
