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RE: gdrv off but no change in current consumption, 1394.....

Thanks, great to see how optimisations reduce power across different voltage lines. To summarise:

  1. default = (12v@0.32A, 5V@3.88A, 3.3V@0.860A) = 26.1 watts
  2. GA H55M-UD2H BIOS optimised (9x100)in CMP = (12v@0.28A, 5V@2.027A, 3.3V@0.698A) = 15.8 watts
  3. same as 2 at 96k = (12v@0.28A, 5V@2.241A, 3.3V@0.714A) = 16.9 watts
  4. same as 2 at 96k (mobo modified) = (12v@0.18A, 5V@2.226A, 3.3V@0.430A) = 14.7 watts


Interesting to see 5V drop is low compared to 12V & 3.3V lines when doing mobo mods. From your extreme mobo modification post, 5V line drives: RAM, H55 chipset, QPI Link, CPU PLL & ITE/Fan/etc.. Gcore and video chips take power from 12V & 3.3V lines. 5V line is most critical supply. Could a simpler mod be done that just provides clean 5V line from linear PSU or battery?

I was wanting to see if video chips on mobo are affected when the actual LCD display monitor is off. Disabling "gdrv" will not switch off display - its an unneeded device driver in Windows. I installed Windows with default BIOS hence I got to see "1394...". In your case enabling it after installation and in cMP mode will cause BSOD.


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