System RAM, How to know if it's working?

I bought some RAM at Fry's. Patriot PC3200 1G, 2 sticks.
My machine recognizes it (I now have 4.5GB RAM - used to have 2.5), but I see no improvement in the number of apps I can open. I have effectively doubled the amount of RAM I was using, but I previously had open Adobe PS, iTunes, CamTwist and Safari, but when I checked my mail, it went sluggish on me... After I added the RAM I saw no improvement.
Is it possible that the machine recognizes the RAM quantity but is not using it, or using it incorrectly?
Is Patriot the wrong brand to use?
Also the new RAM is listed in System Infor as PC3200u-30440 and all the previous RAM is -30330
Can that be hindering anything?

Mac OS X- Reading system memory usage in Activity Monitor. You can also select Activity Monitor Help from its Help menu to get additional information on usage.
Memory management in OS X is not like OS 9. Memory is assigned to applications as they require it and can vary depending upon an application's need and priority. 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
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