Phreak--I think that would probably work, if you have a multi-system TV.
But, I don't know. I was hoping it had more than one clock chip. I am not after faster gameplay, just smoother gameplay. Basically I'm looking for a speed increase like that of a computer. It makes the game play better, not faster.
However, if the PAL NES is slower than the NTSC NES, like Phreak says, that would tend to corroborate what dum dum says. After all, it's hard to believe that Nintendo would have slowed down the PAL release unless they had to. And having only one clock chip seems like the only reason they would have had to. And 30-16.6666%=25, too (NTSC standard is about 30fps, PAL 25fps).
So I guess my hopes of overclocking the NES are dashed. But at least Phreak might now be able to fix his NES.
Anyway, next time I open my NES, I'll look for the clock chip(s) and see if there is just one.