By the metric that the system was slower to use? 2012 iMac had the i7 2600 https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-2600+@+3.40GHz&id=1 https://

By the metric that the system was slower to use? 2012 iMac had the i7 2600 https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-2600+@+3.40GHz&id=1 https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-2600+... 2013 iMac had the i5 3470 https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i5-3470+@+3.20GHz https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i5-3470+... It was noticeable enough in Photoshop that the system ran 30% or so slower.