In a modern PC the +12 V rail is the most important. So based on the posted figures, you have a MAX of 120 Watts on the 12-volt rail.
You have a MAX of 46.2 watts on the +3.3 volt rail
You have a MAX of 100 watts on the +5 volt rail.
Now, the PSU will NOT supply the max wattage of each rail at the SAME time, so I am guessing that your PSU is rated somewhere between 150 -200 watts, with a 250 watt absolute max.