what is the make and model of your PSU or the combined watt output of your 12v rails
i don't know the combined watt output, but the brand is x-power atx-600td. I cant find any information about this PSU on the internet at all.
Could this be the combined output? (3.3V & 5V Combined Max. Output 180W)...this is written on the installation leaflet that came with the PSU.