Hi to you hardware gurus. Here's a question. I'm about to install a new graphics card, the power requirements state that I must have at least 22 amps power at the 12 volt rail (whatever that is)I have a HEC 550TD-PTE power unit, the label on the side says 550watts output and then it has two 12v ratings 12v1 =18amps 12v2=17 amps.My question is does the total of the two figures(35amps) count towards that required 22 amps or does each one need to be over 22 amps ?Any help appreciated.ThanksBob.

BUMP ... since I've got the identical question, as well.

You can find a spec sheet for that PSU here: http://www.aone.zen.co.uk/prodinfo/psu/psu550hec_specs.pdfMy read is that the PSU has two independent 12V supply sources, the combined total amperage being 35W as you state. One rail provides power for the motherboard main connector, peripheral connectors, floppy drive connector and SATA connectors. The other feeds the ATX power connector, which obviously must suck a fair amount of juice itself.According to the spec sheet for my Antec True Power 480W PSU, it has the same dual 12V rail setup, with 18A and 18A per rail and I am successfully using this with my 7900 GTO 512M card. So I'd say yes, based on spec sheets and personal experience, you have at least 22 amps on the 12V rail for the purposes of driving your new video card (which is what BTW?).Gary