i have to ask is it safe to run pc with 550W PSU when i counted the total power consumption to be 320W ?
i dont quite understand these wattage requirements and even the PSU has greater W i just have to ask to make sure it wont blow up in some point?
I should run it, but build is right we need to know what brand it is - if it's PC Power and Cooling, Antec, Corsair, Seasonic, OCZ, or one of a couple other brands you should be fine, but if it's a cheapo generic one, it might be iffy (maybe not enough to blow up, but still not the best idea).
your pc uses 320 watt so thats how much the psu is delivering . The wattage limit for a psu is the point it cant deliver stable voltages or it gets too hot because its over loaded .
Your machine is fine , but as pointed out you dont have a premium brand psu . Since you arent drawing near the limit , and your pc is stable DONT WORRY ABOUT IT TOO MUCH