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What's the mystery with memory? This same question has been asked dozens of times on dozens of forums. Here's my answer in a nutshell:

If you can afford it, buy as much as you can. If you are waffling because 70 bucks for an 8-gig upgrade will break your bank...then you better save your nickels and dimes until you can afford the upgrade or wait for memory prices to drop.

In my 30-plus years of computer ownership, memory was always a good investment...unless, like the stock market, you overpaid.

Rich
Rochester, NY
 
I can see that comprehending what you read is not a strength of yours. By your erroneous interpretation, nearly every manufacturer of anything is a systems integrator, making the term meaningless.

Hmm. Looks like you don't have much experience in this field; I actually work for one and certainly have no problems "comprehending" what I read. On the other hand, you may want to take a look in the mirror and read your last post to yourself.

Anyway, that's strike 3, so don't bother replying; I'm done with this.
 
If the OS shows as using 3.99GB of 4GB, then you'd definitely benefit from more RAM. I'd recommend 8GB. Look at the "Swap used" area as well: if it's getting any action, then you'll benefit. The higher the "Swap used" value, the more you'll benefit. Usually your RAM+Swap used is a good estimate of what you need. Since you have 4GB, going to 8GB is the next step.

You need to learn how RAM works and how OS X displays usage.
 
Hmm. Looks like you don't have much experience in this field; I actually work for one and certainly have no problems "comprehending" what I read. On the other hand, you may want to take a look in the mirror and read your last post to yourself.

Anyway, that's strike 3, so don't bother replying; I'm done with this.

Of course you're done with it. If I had embarrassed myself like that, I'd be done with it too.
 
I saw a bump when I upgraded from 4 to 8GB. I use a lot of Adobe CS5 and also view large vid files (20+ gigs each). 8GB upgrade is pretty inexpensive... 16 GB on the other hand is pretty cost prohibitive at the moment.
 
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