I need to replace the hard drive in my old Mac Mini (Core 2 Due 2ghz) and ordered a Seagate Momentus 500GB. While I'm at it, I want to upgrade the memory from 2GB to either 4 or 8GB. I checked Crucial and it says it needs DDR3 PC3-8500. It looks like it's the same type of memory I pulled from my Early 2009 iMac. Since I just upgraded the memory in the iMac to 8GB so I have the 4GB sitting around. The specs for the two look identical to me. Does anyone see a problem just using the memory from the iMac? Also, for anyone apprehensive about opening a Mac Mini, having never done it before, it took me less than 60 seconds using a putty knife.