ADDING RAM - Who's done it? Is it worth it?

G'day,
I'm about to buy a Black MacBook and I'm keen to upgrade to 4GB, but ive been reading threads here and am a little reluctant to do it because of the probs people have.
Is it a simple process? Is it likely to cause problems? WIll I actually notice the jump to 4GB?
Obviously I'm not talking about paying apple $500 to do it. Are Crucial worth going through or is there a better company etc.
Basically I'm just after some advice and some warnings.
THanks in advance.
John

It is VERY easy and takes about 20 minutes! but, if you brake anything, it is NOT covered under you Apple warranty.
For memory you can go with the just about any brand that is PC5300 DDR2 667MHz 200 Pin
A lot of people like this website for HDs and memory, this is where I get my parts, and I have been VERY happy with the service and quality.
http://eshop.macsales.com/shop/memory/MacBook/DDR2/
http://www.ifixit.com/Guide/ has great instructions for installing memory and RAM.
Memory Benchmark (performacce tests)
http://eshop.macsales.com/shop/MemoryBenchmark/AppleMacBook/
Hope this helps!
-Mike

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Viewed from the side
======== Slot J14
======== Slot J12
======== Slot J11
======== Slot J13
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About OS X Memory Management and Usage
Using Activity Monitor to read System Memory & determine how much RAM is used
Understanding top output in the Terminal
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Adding RAM

I'm trying to determine if I will benefit from additional RAM. I have a 24" iMac with 4G RAM. I can upgrade to 8G at a cost of $400 but I hate to spend the money only to learn that there is no significant difference in operation.
I checked with Activity Monitor and I'm using a lot of VM, especially with my "heavy" applications, Photoshop/CS5, Lightroom and Capture NX2 (Nikon's equivalent to Lightroom). With those apps, I typically use 1G real memory and another gig virtual memory. Will I benefit from additional memory?

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See:
About OS X Memory Management and Usage
Reading system memory usage in Activity Monitor
Memory Management in Mac OS X
Performance Guidelines- Memory Management in Mac OS X
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Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.
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ADDING RAM - Who's done it? Is it worth it?

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