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Do applications need to be 64 bit for it to be able to utilize more than 4 gigs? I know that is the case for Windows, so I was wondering if it applies to Macs as well.

I don't think the applications have any bearing on that. It's the OS that decides how much RAM a process gets.

Technically a 32-bit OS can only address ~4gb of RAM, but there are workarounds for that as well.
 
I remember running Cs2 i think on 512mb of ram lol worked fine..

Anyway i now multitask like crazy and have 4GB of ram, i think it's time for more power Muahahahaha Ordering 8GB in a few days. Now would it be a good idea to keep the 4GB i have now as a safe backup or try to sell?
 
If you don't use graphics or video programs like Photoshop, Illustrator, FCP, Flash, I honestly don't know whether it would be crucial for you to go the extra step.

However, I can say that in my experience, I've worked with certain large graphic files, such as posters over 1GB in size, that I was simply not able to open in Photoshop (or would have to wait 20-30 min to open) when I had 2GB or 4GB RAM, but when I upgraded to 8GB I was actually able to open these files and make changes. When I upgraded to 16GB RAM and swapped my hard drive out for SSD, I was able to open them pretty quickly.
 
After Effects has a limit on 3gb of memory allowed to be allocated to the program. You can do this in one of the settings. Photoshop might also have a limit aswell. I cannot remember exactly where and how to get to the menu for it. I think its one of the "secret" menus. Usually adobe does this to make sure you do not take memory away from the processes to run the OS.

8gb would allow me to run AE, PS, AND C4D seamlessly. Man that would be nice.
 
I remember running Cs2 i think on 512mb of ram lol worked fine..

Anyway i now multitask like crazy and have 4GB of ram, i think it's time for more power Muahahahaha Ordering 8GB in a few days. Now would it be a good idea to keep the 4GB i have now as a safe backup or try to sell?

im looking to upgrade to 4 gig *hint hint nudge nudge*
 
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