There're two different iMacs in my household, both are the exact same system (27", i5 3.4GHz, GTX 775M 2GB, 16GB RAM) but iMac A's GPU runs hotter than iMac B by 8-10 degrees. The real problem is that the fan on A sounds like a hover jet and B's doesn't. Both running recent installs of Windows 10 with identical settings, running the same game (Dawn of Discovery: Venice) at the same time with the exact same settings. iMac B has Windows installed on a hard drive whilst iMac A has it installed on an SSD (USB 3 w/ UASP) See attached images for max GPU temperature. Any thoughts on what this can be?