I have a mid-2011 MBP that I upgraded to 8GB RAM (removed the 2-2GB modules it originally came with). I also am installing an SSD in my mid-2011 iMac 27". It currently has 4GB of memory (apparently 2-2GB modules). Since there are two empty RAM slots in the iMAC, is the RAM I removed from the MBP compatible with the iMAC? If so, I might as well double the RAM in the iMAC, right? In other words, any reason not to put the two 2GB RAM chips into the iMAC?
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RAM compatibility between MBP and iMac
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Both iMac and MBP use 204-pin DDR3 SO-DIMM RAM modules, thus the two 2 GB modules from your MBP will work in your iMac and give you 8 GB RAM.