I think the issue might be related to the fact that a quad core processor board was being used on this 2010 Mac Pro from a 2009 Mac Pro. The processors were recognized, but I think the fact that the processor board was a year older was the culprit that was contributing to the “fans on full” results. I think that a 2010 Mac Pro needs a 2010 Processor board. The 2009 boards fit, but obviously they are not compatible. They would need to be calibrated, and as far as I know, that capability went away with the G5.