For the solution to the initial question of the thread, the Slice branch of HWsensors has some progress on the support of the Maxwell chipsets. On my 970 I get temperature and frequency scaling as they should (incorrect frequencies in iStats menu but correct in HWmonitor).
http://sourceforge.net/projects/hwsensors3.hwsensors.p/files/?source=navbar
And the extract of my boot log:
16/02/2015 21:43:50,000 kernel[0]: GeForceSensors: GeforceSensors by kozlek (C) 2012
16/02/2015 21:43:50,000 kernel[0]: GeForceSensors: found 13c2 Nvidia chip
16/02/2015 21:43:50,000 kernel[0]: GeForceSensors (0): chipset: GM204 (NV124) bios: 84.04.2f.00
16/02/2015 21:43:50,000 kernel[0]: GeForceSensors (0): started
Also I couldn't boot until I removed the NVClockX.kext which I set as part of the installation. For now I have ACPIMonitor.kext, FakeSMC.kext, GeforceSensor.kext (checked the new nvidia card bow in the install), HWinfo.kext, IntelCPUMonitor.kext, ITEIT87x.kext.[/QUO
its not work.
GraphicsSensor: PCI 5 Frozzen
And GerofceSensor.kext its broken