You might want to look at a power system design book that has been published in the last 20 years, gman.
Most all computer power supplies are now universal input switch mode converters and will operate with line voltages from 85 or so up to the mid 200s. Everything apple now makes does this - and automatically, without any need for manual input voltage selection or any lossy "240 to 120V conversion."
As other have correctly pointed out, the only advantage to the higher mains voltage in some countries is lower input AC current and associated smaller gauge wiring in the mains circuitry. The power dissipated in the computer by both the electronics and by the power supply will be the same to within a couple of percent. And yes, power is heat.
Most all computer power supplies are now universal input switch mode converters and will operate with line voltages from 85 or so up to the mid 200s. Everything apple now makes does this - and automatically, without any need for manual input voltage selection or any lossy "240 to 120V conversion."
As other have correctly pointed out, the only advantage to the higher mains voltage in some countries is lower input AC current and associated smaller gauge wiring in the mains circuitry. The power dissipated in the computer by both the electronics and by the power supply will be the same to within a couple of percent. And yes, power is heat.