New topic, because the other one seemed pretty focused on different things, hope that's okay. Hey, so my knowledge when it comes to these things is very limited. I have a 21,5 inch late 2009 iMac. (entry level hardware). That means 4 GB of RAM. The iMac has 4 slots, available via the bottom of the screen. I was thinking about upgrading this and adding another 2x2GB of RAM. Now I don't really know alot about this sort of thing. When I buy the RAM, I need to make sure that everything listed here (under late 2009 iMac) is right. It has to be 1066 MHz DDR3 SDRAM and it has to PC3-8500 and it has to be 204-pin. Is that true? So this (german amazon link, sorry) would not work. But this should work, right? (are there any cheaper options than this, btw? Or should I go more expensive?) Thank you guys in advance!