I just installed it on my Late 2009 iMac with no problems and minimal fuss. I had 2 x 2GB = 4GB but I upgraded to 2 x 4GB = 8GB. First turn off your computer and disconnect it from the network. You only have to loosen three screws on the underside to open the RAM slots. Gently but firmly pull the tape to remove the old RAM, then use two fingers/thumbs to insert the new RAM in the same orientation as the old ones. Replace the cover with three screws and start the computer. If you got it wrong or there is a RAM issue it should be pretty obvious, but if you want to check it go to Utilities -> System Information -> Memory and it should tell you the size and status of your new RAM. You might not notice a huge difference in load times, but navigating your operating system (especially newer ones) should be smoother and memory-intensive programs like Chrome will run faster. For boot times and other speed improvements, I would recommend upgrading your SSD. The only sticking point in this whole process was checking the part number and compatibility elsewhere. I don't know why Revain listed this part number, but it should be the same as CT3373664 on the Crucial website, or maybe CT2K4G3S1067M on Newegg (?). Much luck!
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