Dell XPS 630i 750watt PSU question

my main gaming pc is a dell xps 630i and it has all the better/higher parts in it and i was looking at the psu last night while installing a pci slot fan and i noticed this where it shows the amps for the different volt rails (12,5,3 i think) i saw this:

12+1=18A
12+2=18A
12+3=18A
12+4=18A

now does that mean this psu has 4 12+V rails??? i honestly dont know, it has 2x pci-e 6-pin connectors (no 8-pins) and also does that mean it 36A for each pci-e connector??? currently i am running a 9800GX2 with 1 pci-e connector using an adapter that takes the 6-pin and makes it into 2x 6+2 connectors, if thats unclear here is what im using http://www.newegg.com/Product/Prod [...] 6812198016

so if anyone could clear this up that would be great. because if this thing has 4 12+v rails i might look into SLI GTX 280 with this thing. thanks for any help

well the model number is "DT50E", its a dell psu

well SLI GTX280's, i was kinda joking about that lol. i just bought a 9800GX2 so ill be fine for a while. i just wanted to know if i had 4 rails and if that is for each 6-pin pci-e connector. im running my GX2 off of one of the pci-e connectors so i guess so. thanks mactronix. it will be a long while before i think about sli gtx280's.