Go to the Apple support page located at http://support.apple.com/specs/powermac/Power_Mac_G4_Quicksilver.html Here are the electrical requirements. 50 vs 60 Hz is not an issue. Electrical requirements and agency approvals • Line voltage: 115V AC (90V to 132V AC) or 230V AC (180V to 264V AC) • Frequency: 47 to 63 Hz, single phase • Maximum continuous power: 360W HTH, John > > > On May 9, 2008, at 1:12 PM, Linda wrote: > >> On 5/9/08 12:54 PM, Jon wrote: >> >>> However, the Quicksilver model, for example, would require a >>> converter, as would the current Mac Pro. Apparently. (Both >>> specs say 100-120 volts or 200/220-240 volts; the "or" means, >>> to me, that a converter is required in 220 volt countries. So the >>> pro models vary. >> >> I had a Quicksilver (PowerMac G4 dual 800) and there was a switch >> on the back to select your voltage. No converter needed, you simply >> needed to choose your voltage with that switch. See page 8 of the >> Setup Guide. <http://docs.info.apple.com/article.html?artnum=50018> >> >> _ > > I am *NOT* an expert in this area... but I think the main issue is > 50 vs 60 cycles. The 110 and 220 is easily done (like you said) a > flip of a switch (provided there is on). > > Ed >