Is a dual frequency oscillator modification for an NTSC PlayStation worth it?

As the title states I'm just curious. I have an SCPH-7501 with a PSIO running into an OSSC via RGB SCART. Would a DFO mod be redundant or useful? Thanks!

 

The only possible reason I can think of is if you wanted to play PAL rhythm games. With your setup the only practical effect is that PAL games will run at a frame rate of 50.46Hz rather than 50.00Hz. In most cases, this is not going to be noticeable - it's possible that some games would be adversely effected, but I don't have a list of them. Going the other way (NTSC games on a PAL console with the original oscillator) the only titles I can remember significantly screwing up were some Japanese Bemani games.

It's of somewhat academic interest to you since you are using RGB, but on your machine fitting dual oscillators won't have any effect on the composite and Y/C outputs from the console either - it will continue to generate a 3.579MHz color burst in both NTSC and PAL modes. On the older boards (PU-8, PU-18) fitting the dual oscillators will give you the correct sub-carrier frequency in both NTSC and PAL modes.

 

It's worth noting that the old color burst clock pin is still available and working on newer consoles.
So he could install a DFO, disconnect the color burst pin from the console's clock gen, and use the one from the GPU.
The GPU would then generate 4.43Mhz in PAL and 3.57Mhz in NTSC modes, just as the old machines did it

 

That will work, but I personally wouldn't recommend it unless you are using real oscillators (I.E. not the synthesizer based ones) - the reason that the clocking was changed in the PU-20 and onwards was precisely that they had started to use a clock synthesizer and they exhibit substantially more phase noise than an xtal does. This is also why the crystals used on the later consoles are still an exact integer multiple of the respective color burst frequency for each video mode - a divide by n counter should not create any appreciable additional jitter and a PLL will.

 

Thank you both for your replies! A part of me really wants to try it because of the challenge but it sounds like the games that would be affected I would have no interest in playing anyway. Just in case if the idea nags me to attempt it in the end would this board be the one I'd choose?
http://i.imgur.com/CzlNOEp.jpg

Although I don't see the normal oscillators like the older models used so maybe that one is synthesized since it is programmed. I might just pass on it then since I can't find anything on google for a pu22 ntsc console.