Problem!! PWM frequency UNO vs MINI

thanx pert!

I'm going to measure the timestamp on Input Capture Pin, Pin 9 on the MINI(rising)...

But that is not important right now, what I'm wondering is why do I get different frequency on my pwm when I'm using the same code, on an UNO(328P) vs an MINI(328P)?

And what can I do to get the MINI to give me higher frequency?

and btw what does the low_fuses=0xff vs low_fuses=0xFF (same right?)
and High_fuses=0xDEvs High_fuses=0xD8?

I got a avr Dragon so I can see the fuse bits on the UNO, but I can't get contact with my MINI... anyone got a drawing?

thanx!!
HanFre