Methods used to find stable voltages:
1. find lowest voltage that passes NHC test
2. test the voltage for stability in real life applications: running firefox, playing 15-20 mins of youtube videos (max 720p), using Eclipse, playing music (in my case every NHC "stable" voltage above multiplier of 6 required a 1-step-increase of voltage to run stable in all my applications)
The voltages stipulated below are stable for my particular CPU and my particular motherboard. Please use these as a starting point for your tests rather than a ready answer.
My CPU is a Dothan 1.7 (fsb 400MHz), my motherboard is one with dedicated ATI GPU: Radeon 7500
Lowest stable voltages:
Model: T42, CPU: Dothan 1.7 (Pentium M 735), Motherboard specs: Radeon 7500 Multiplier Voltage 6 0.700 8 0.732 10 0.796 12 0.860 14 0.940 17 1.068Please share your undervolt settiings below, this might help some oldtimers silencing their T4Xs