I know there have been lots of posts about odd fan behavior with higher power graphics cards. I’ve made at least one myself. I’ve got a 4,1 flashed to a 5,1 with a W3690 six-core installed. I think 32 GB RAM. I’ve tried every recommendation I’ve found to stop the fan speed changes I get with a flashed reference EVGA GTX 680 installed. They annoy me to the point of not wanting to use the Mac. I don’t really want to buy another 4,1 to fix this but is this something that does not occur in every flashed 4,1? Would it stop if I downgraded to an original 4,1 CPU? I had another flashed 680 in a dual 2.93 4,1 and never had this issue. Can I swap CPUs or do I need to reverse the firmware flash? Finally, are there any newer graphics cards that offer similar (ideally better) performance than the 680 and draw less power, avoiding the fan issue? I go so fed up with this superior “5,1” that I upgraded a 3,1 to dual quad 3.2 GHz and have been working on getting Sierra through Mojave running. I’m having so many issues with that (even before those upgraded) that I’ll probsble follow this with another post!!! Looking for help please! I don’t want to turn to a Hackintosh again but I will if I can get a nice quiet, stable Mac Pro running.