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The thresholds cannot be changed. They are hard coded into the circuitry of the systemboard.
the motherboard was swapped like for like (375-3325)There may have been a design change that was imparted into the manufacture of those parts. The lower thresholds (as you can appreciate) give a tighter tolerance for high temperatures. A very strict tolerance but 96C is still a hot shutdown limit for a CPU module.
If you can find the time and take the cover off the box, try to find the paper sticker that is on the new board. Find that part number of 375-3325 and then take note of the very next two numerical digits after that --> 375-3325-xx
Those digits represent the manufacturing revisions on the design of the part.
It is likely too late to examine the old board, but it probably was an older revision.
Thanks for the input rukbat, The boards were both 375-3325-04 Rev:50 so I'm not sure why the thresholds have changed.
My only reasoning for it is that this Part Number goes into both V240's and Netra 240's so I'm guessing the lower threshold is for the
V240 and the higher threshold for the Netra 240 (as they are more robust)
So maybe the board I have is meant for a V240, just seems strange that they have the same PN though.