I just want to confirm/await correction on what I need to upgrade my RAM. I a professional photographer and I deal with very large files. My iMac slows way down when I am working with the files in PS, LR, ACR, etc. I assume a RAM upgrade is the thing to do. My computer is this: http://support.apple.com/kb/SP623 C02FGAUADHJQ S/N iMac 27/3.1QC/2X2GB/1TB/6970M I just to confirm that buying two of these would be the right thing to do? http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=D7B46CD9A5CA7304 Thank you all so much in advance!