Try the new Bios 1.9. It was just released. My computer CPU activity dropped by a lot and the temperature at idle now go to 43C instead of 55. The power draw on the computer also dropped a lot. I don't know why it took so long for them to update this. But it's here and seems to solve the problems. Now when gaming the temps wont go above 88c. Before 100c was a rule and a had to reduce TDP to 30w . Now I leave it at 45. Anyway I disable the other features such as "Short Max turbo boost" and I also undervolt a bit using XTU. Now also there is an option on the Power Management software that you can adjust the state of the cpu and FAN together which makes a diference. Interestingly I leave mine on the "ultra performance" all the time and it is when my cpu runs coolest using less Wats of power when idling. Some will say that it's because the fan turns on. But no, it's off. But it comes one at about 55c I guess.
I do have a G5 5587 machine. I cant load Bios.
Dell has exchanged the MB and loading of Bios 1.8 and 1.9 still fails.
Waiting for feedback from Dell to why this is happening.
Does anyone know why the G3 BIOS is several iterations behind the G5/G7? I just bought the G3 and went with BIOS 1.3 which sounds like the last "good" one. My temps are fine, but every couple of minutes when idling or under very light use, the fans will kick on to full speed, slow to a low speed and then shut off again. This happens every minute or two and it's extremely annoying. The temps are in the low to mid 40s, so there is no reason for the fans to be doing this. I've undervolted and repasted so temps are not a problem at all. I've tried many fixes to this including uninstalling and reinstalling the thermal drivers, running in all different modes, unplugged or AC, etc... but the fans will always do this ramp up, quiet idle, shut off cycle and it's super annoying.
GIVE ME FAN CONTROL.