Bad RAM?

[Delorean2006]

how could i tell if my ram has gone bad? i upgraded my ram some time ago and i was wondering if maybe it has gone bad only because things have become so slow on my computer and when you need a lot of ram to run things, like using safari in full screen, browsing, video editing, just things have been so laggy at times...please any insights, thanks

 

[T5BRICK]

How full is your HDD?

Run AHT to test for hardware issues:

http://support.apple.com/kb/HT1509