I have used both a thick iMac and a thin one. I had to run the thick iMac's fans at full speed all the time or else my CPU would bottleneck. The thin iMac had

I have used both a thick iMac and a thin one. I had to run the thick iMac's fans at full speed all the time or else my CPU would bottleneck. The thin iMac had underpowered fans and constantly throttled.