what chip does a late 2015 iMac have?
attempting to use Apple Diagnostics for our late 2015 iMac, however Apple only lists the newest of the new and not our year .
iMac 21.5″, macOS 11.6
Sorry but your question is poorly written. We have zero idea which model 2015 iMac you own. In addition it has many "chips" installed including the GPU, CPU and many others. I would recommend you Google "2015 iMac System Specifications" until you locate the model you have. I would also strongly recommend that you read Writing an effective Apple Support Commun… - Apple Community so we can more effectively help.
