RAM - capacity and type
I have an iMac 20" / 2 GHz / 512MB RAM computer. There are 2 slots for memory boards EMC No.: 2105. Only one slot is used = 512RAM. Can I purchase an additional 512RAM board without removing my current 512MB board? Or, do I have to remove the current 512MB and purchase a 1GB ram board? Also, please advise specifically which memory board I should purchase? I'm probably not using the correct lingo. Thank you for your help...