I got a 2010 iMac 21.5'' 3.06GHz Intel Core 2 Duo, with 4GB 1067 MHz DDR3 RAM. My computer has been running slower lately. I used to be able to Open Safari with multiple tabs, open iChat, and iTunes, and have absolutely No Lag! Now, whenever I open multiple apps, I get the spinning beach ball. Thought my HD was dying, took it to the Apple store, genius checked it, and it's fine. He suggested getting more RAM to improve the performance on my iMac. I currently Got 4GB, and I found this: http://www.newegg.com/Product/Produ...na&AID=10521304&PID=4178070&SID=1r6vqohdow8x2 Kingston 8GB (2 x 4GB) DDR3 1066 MHz for $80. When looking at more Information about my Hardware. In Memory, I saw this: BANK 0/DIMM0 Empty BANK 1/DIMM0 Empty BANK 0/DIMM1 2 GB BANK 1/DIMM1 2 GB Will I be able to install the 8 GB of RAM in the 2 empty slots (4GB in each slot), to have a total of 12GB? Also, how will I be able to install this? I came across this video: http://www.youtube.com/watch?v=Fb_B3K1Za5Y but I'm not sure if it'll be helpful with my model of iMac. Any thoughts?