On my PB the ticks is 20...

Anyway my mini with 1.58 GHz play the same 720p movie smoother and less cpu power (5-10%) than the faster (1,67GHz clocked) PB. Maybe it is because the current ATI drivers slower on PB than on Mini not the overall Memory speed gain.

Anyway i have a feeling that either ram latency is different because the overclock, and the ram stick can handle it, or the FSB is not 167MHz. For example 200MHz.

One more data: Under uae, with exatly the same config/system My PB is scored in sysinfo about 0.68% of an Amiga 4000@25MHz, while my mini is 0.98% of an Amiga 4000@25Mhz