> 40.00W - Efficiency 67.68%
> 60.00W - Efficiency 75.71%
> 80.00W - Efficiency 80.16%
> 100.00W - Efficiency 83.02%
> 
> Bet cia +/- dzin .. gaunas tiek kiek reikia kompui +20W papildomai PSU.
> Labiau efektyvus vis vien nebus 40W+0W sumoj 40W...
>
> +20W*24*365/1000= +175,2 kWh/online_metams

> 

Kitas palyginimui:
http://www.techpowerup.com/reviews/FSP/AURUM_92_650W/5.html

40.00W - Efficiency 79,60%
60.00W - Efficiency 84,93%
80.00W - Efficiency 87,77%
100.00W - Efficiency 89,33%
 
Gaunas tiek kiek reikia kompui +10-12W papildomai PSU.

+10W*24*365/1000= +87,60 kWh/online_metams
Sutaupoma 88kWh per metus, kas 88*0,474=~41,52Lt/metus 
(3 cieli litai ir da kemsesios kapeikos per menesi tam tikrai apkrovai).

Aisku, jei kaina ne baisiai skiriasi kelias desimtis litu efektyvesniam PSU dar galima skirt.
Bet norint labiau taupyt elektra - labiau dometis ne PSU, o CPU/GPU energijos/galios santykiu.