I upgraded my iMac 27" (Mid 2011) from 8GB to 24GB using this 16MB kit (2-8GB sticks). I also upgraded the hard drive to a 1 -TB SSD upgraded. "Wow, what's the difference! Now this thing is lightning fast. It may be 10 years old, but it competes with new machines. It has an Intel Core i7 clocked at 3.4 GHz."
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