Custom Resolution Utility (CRU)

[hannes69]

Hello!
I´m new to using CRU and it seems to work so far.
I want to use CRU in my future setup to improve my HTPC settings.
At the moment I´m working with Powerstrip. I have 4 different resolutions for my projector, all 720p 1280x720 but different refresh rates (23,976 / 24,000 / 25,000 /29,970) each x2 for judder free playback for all different movie framerates. I fiddled around some time to get the perfect settings, I get no single framedrop or -repeat within 3 hours for each resolution, sufficient for a movie.
I check first the movie framerate, then I manually switch to the right resolution with Powerstrip shortcut, then I watch. This process could hopefully be automated by using madvr´s display mode switcher and CRU. Beside that I want to replace my current GPU (Radeon HD4550) with a newer model with more power, Powerstrip fully supports only models up to the HD4000 series.
So two reasons to change over from Powerstrip to CRU.
So what´s the problem? - As far as I can see, CRU allows setting the pixelclock frequency to 2 decimal places, that isn´t sufficient for a really accurate setting of the refresh rate for a movie to avoid framedrops/repeats. With Powerstrip there are 5 or 6 decimal places, that´s ok.
So, where sits the limitation of this within CRU and why can Powerstrip work more accurate?
Another question to ToastyX especially because as author of this software I hope you can give me an answer or idea:
Is there an tool / excelfile / script to show combinations of the porches with corresponding pixelclock setting for a wanted refresh rate? The intuitive logic for fiddling around with all porch settings to get an appropiate refresh rate isn´t so good... There are tools and websites where you can enter the porches and pixelclock to get as a result the corresponding refresh rate, I want it the other way round. Clearly there is not 1 solution, so it must be a suggestion of multiple solutions, perhaps sorted by deviation of the wanted refresh rate. If I have the formulas I could probably write a little C code which could do that, but maybe it isn´t as simple as I´m thinking. I searched the web for a while but wasn´t successful. With such a tool one could then test all the given combinations and hope that one is working with the monitor/projector. And hopefully one of them would be accurate enough even with 2 decimal places (if it isn´t possible to higher this number).
I know there is the solution of madvr´s smoothmotion to work around this problem, but this feature consumes some amount of GPU power and it isn´t the PERFECT solution for videoframe-to-refreshperiod-transformation.
Hannes.