I asked something similar in the news forum and stat menus thread but thought i was worth asking here too. I have a 2009 quad core mac pro and have been using iStat for years to monitor temps/cpu usage. I upgraded to iStat 4 this evening and noticed the added temps for PCIE slots and CPU B. I was a little worried when i noticed the PCIE temps on all slots and CPU B read as 129C. Since i don't have a CPU B i'm assuming this is an error with iStat 4? Has anyone else had this? Heres a pic if it helps. Please note my temps are in Celsius.