My main question (1) is: is there a way to use the inspiron 8500 at full CPU speed when not using the Dell PA-10 AC power adapter? I've been planning on using the laptop in a remote location off a bank of car batteries. I'd like to use a DC adapter to power the laptop, but I’ve noticed, since the AC adapter isn’t recognized it runs the CPU at half speed. Setting Speedstep to run at full speed for both AC and Battery doesn’t make a difference.
Both the 65W Dell AC/DC adapter (Manufacturer Part# F2663 / Dell Part #: 310-4804) and the 70W Targus air/DC adapter (Manufacturer Part# PA358U / Dell Part #: A0098237) are lower wattage sources. Neither will recharge the batteries in the 8500 so I assume neither will run the 8500 at full CPU speed.
The option is to run the replacement PA-10 AC adapter from an inverter. Since the AC adapter is an inductive load it may be damaged by non-pure sinusoidal inverters. This would mean that I’d have to go with a very expensive pure-sine inverter if I don’t want to risk burning out the new AC adapter.
Other Questions: (2) Is there a DC adapter that provides 90W? (3) If so would the i8500 recognize it as an approved power source? (4) Is there a way to fool Speedstep into running the CPU at full speed? (5) Am I missing something obvious?