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Proceed with caution as Samsung EVO drives do not play nice with older Macs. Something to do with the 6Gb/ps SATA III not being fully backwards compatible with the iMacs SATA II 3Gb/ps speed. Make sure the seller will exchange if you have problems.

Have a read of this from ifixit, particularly the post by Dan c on a Jeep and a Porsche on a gravel road. Also seriously consider replacing the SATA cable which ever way you do go:-


https://www.ifixit.com/Answers/View/252412/Problems+with+Samsung+850+EVO+SSD
 
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