I am listing the complete details of how the EDP 1.9 is running on my D830 Intel machine. I did a fresh install and here are the results:
1- WiFi, Audio, Graphic Display (1280x800), Keyboard & Trackpad working fine.
2- Audio delay is negligible.
3- Extended display works best when the VGA cable is attached as the system is being booted.
4- As with EDP 1.8 the normal operating temperatures for my D830 were plus 55 C and above. Now they stay below 50 degrees some time below 40 degrees as well, so yes the machine is operating at lower temperatures.
5- Sleep is not working, Wiki instructions are of no help as sleep remains disabled. Instead when the sleep function is choosen from menu or lid is closed the only thing that happens is screen getting black. The power light stays ON and stable, thus no breathing. Opening the lid or pressing the power button does not bring the display back.
Update1: Sleep issue resolved, rebuilt the Kexts, using EDP tool, selected Applepower management instead of NullCPU as advised by Bronx.
Update2: As expected after removal of NullCPU the running temperatures are higher as compared to with NullCPU installed.