So I'm using Gigapixel AI to work on a large image to recover faces. It warned me it's gonna take a long time. Great way to work the iMac M3 GPU Cores. GPU are running 98% for over an hour. Temperature front, bottom, Middle are where the fans exhaust comes out is near 100-102 Degrees. At the back where the magnetic power cord attaches, bit above it is about 101-102 degrees. The rest of the iMac depending on location ranges 88-90 degrees...near the usb ports about 93 degrees. CPU running low because it's all GPU on this thing. You can finally hear the fans, but it's not super loud or obnoxious.