I have a 2006 Mac pro 1,1 - 2 x 266 GHz Dual Core Intel Xeon, 16 GB 667 Mhz Ram, running El Capitan with an ATI Radeon HD 5770 graphics card. I recently downloaded "Hardware Monitor" as a free trial and I just want to know if these temps are normal as some seem rather high. Ambient Air - 26 C CPU A Heatsink - 31 C CPU B Heatsink - 33 C CPU A Proximity - 40 C Expansion Slots - 36 C HDD Bay 1 - 29 C HDD Bay 2 - 29 C HDD Bay 3 - 28 C HDD Bay 4 - 28 C Memory Bank A Point 1 - 39 C Memory Bank A Point 2 - 45 C Memory Bank A Point 3 - 45 C Memory Bank B Point 1 - 32 C Memory Bank B Point 2 - 34 C Memory Bank B Point 3 - 35 C Memory Module A1 - 73 C Memory Module A2 - 78 C North Bridge Heat Sink - 64 C Power Supply Location 1 - 40 C Power Supply Location 2 - 38 C I do get this message when I start the Monitor however, so I'm not sure if the readings are accurate. This version of Hardware Monitor will not run on your Mac. It is designed to work with Apple computers officially supporting OS X 10.10 Yosemite which have been released before 7/1/15. You can try to submit technical information about this Mac to us, helping to develop future versions of Hardware Monitor. (Select the menu item “Help > Submit Compatibility Report“.) We cannot guarantee support of this model series, however.