One mystery still eludes me, what is the significance of this magic 127.5 C ?
I don't think there is any. When electronic devices don't get enough power they can display all kind of garbage data.
last night I inspected the extender cables and they are in very poor shape, I re-soldered some of the connections that have come lose and it allowed me to get the rig back up, one of the pci extender cables is beyond total repair (its amazing to me the thing works at all considering there are at least 5 leads that are un connected where the ribbon cable meets the pcie slot) so on that extender cable I replaced the 5870 with a 5830 so there would be less power draw. This allowed me to get the rig back up until I get the new extender cables, its obvious to me that these things are hand soldered by Chinese graduate students, and they do not last forever.
Yeah if the PCIe extenders are in that bad of shape the resistance is going to go up and thus it is going to mean more current, possibly more than the MB can supply.