Yes. You can find specs on all Apple products, including maximum RAM:
Hey guys thanks for the help. GGJSudios thanks that link is very helpful.
I upgraded the RAM when I got the computer with crucial memory to 2x2 GB sticks. Would it be okay if I purchased a different brand 4GB and combine it with one of the 2GB sticks?
Yours is not the same model as the OP's, which is a 2.6GHz, not a 2.8GHz, and which has a maximum RAM of 6GB. You'd know this if you read the links, as I suggested.
Absolutely correct. What's shown in "About This Mac" is how much RAM is installed, not how much RAM can actually be used. Look at the System Memory tab of Activity Monitor to see how much RAM is actually usable.Also the screen shot is useless. My old 06' black macbook would report 4GB in "About this Mac" but in istat and menu meters it would only show 3GB as that was the limit. It's better to take a sreenshot of that to show the available amount of ram.
Apparently, you did, or you wouldn't have posted this:I missed nothing.