+12V Dual Rail Amperages

kitchman

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Mar 21, 2006
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Howdy all,

I just got an OCZ600ADJ-SLI with the dual 12V rails.

I am worried though, because the second rail only provides 20A on the molex, sata, and pci connectors. I have a 7200 rpm 120gb WD and a SATA 36gb 10k rpm, two 7900 GT's in SLI, and old 1x DVDRW and CDRW 24x.

According to the eXtreme wattage calculator I'll draw about 18.5A (at max load?) with these devices running on that rail. When I put in 10% values for the capicitor aging and surge compensation It goes up to about 26.41A.

Which figure is more reliable, 18.5A or 26.41A, and if the former, is this too close for comfort?
 

doolittle

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Well on my 7800Gt it has the PCIE connector at the end of the card, which I plugged in to the 2x4-pin HDD molex adaptor so in theory it is drawing power from both rails.

edit: so at max draw, even w/ the 26A it will be split between the both rails so you should be fine - BTW that is a nice PS...
 

kitchman

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Mar 21, 2006
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I see. Do you have the A8N32-SLI deluxe mobo?

If so did you plug power into the PCI-e on the card and to the EZ-Plug on th mobo?
 

doolittle

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Absolutely, since I was a bit paranoid that my power supply didn't have the full 24-pin I plugged in power anywhere I could (the "ez-plug", didn't realize it was called that lol), and the pci-e aux / molex adaptor.
 

fainis

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Feb 10, 2006
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it is very important to have ..a pci express connector otherwise your card will draw current from your mobo therefore from your first 12v rail......

so the first rail supplies the cpu (mobo regulators) and the second rail feeds the hdds optical storages...pci express cards...in here the video card consumes a lot comparing to others....

i see you`re worried about the second rail ..... 20 amps for a sli set it quite small indeed ... that will be 240watts cc ... unless you know exactly how much amperage one card needs .. you could only try and see what happens ..... nothing dangerous could happen except same restarts during benchmarks.........
good luck ....
 

kitchman

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Mar 21, 2006
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Nothing dangerous? Just a bsod and/or reboot?

Yeah 240w aint much even though i know these 7900 gt's apparently use less power than the 7800's did due to 90nm fab.

But doesn't the card draw some of its power from the board (1st rail) and the rest (aux/supplementary) from the 2nd rail?
 

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