Woo! Fan Speed Modulation! (sort of) I've spent the last few days plodding along to work out modifications for the fan speed on the P650RE Basically, I've located the read and write locations for the fans in the Embedded Controller, and mapped out some reasonably accurate formulas that show both what inputs you need to reach a target RPM and vice versa. I've put it all into an excel workbook including an Embedded Controller 'sim' so that you can check the consequences of any changes you want to make before you actually write them to your EC. A few example fan curves are also provided. If you do decide to write to the EC, I recommend using RWEverything, and please for the love of all that is good BE CAREFUL! While I'm confident there shouldn't be any issues, there's always the possibility that your EC version or laptop model may have the offsets in slightly different places. If you're in doubt, put your own EC values into the simulator first and see if they make sense before starting to make changes. This may work with other Clevo models, but there's no guarantee of success. The only offset you should be changing is 0xE7. If you write to other random offsets you could damage something, necessitating a CMOS reset. (Technically you should be okay to write to any of the values mentioned in the workbook as they'll simply be replaced when the EC updates, but it's a risk for nothing. I've already blindly tested them - they have no effect, so why mess with them?) Note that macros are required for two calculations to work, but all others should work without. Here are images of the pages if you don't want to download the workbook. Next step: Find a way to read and write to the EC in .NET/C# and turn this into a program.