Hey guys, I am very new to this whole adding ram thing, I really don't want to mess anything up so could somebody help me? I currently have a (current model) 27"iMac with 4GB of ram. Would everything work alright if I added this 2x4GB ram? http://eshop.macsales.com/item/Other World Computing/1333DDR3S08S/ I know this is probably a really dumb question, but I just don't want to mess anything up. Thanks!