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Seasonic m-12 and PCI express connector vs 2 12V?

post #1 of 9
Thread Starter 
I have the seasonic M-12 700W. Currently I have 2 of the 12V into the adapter for my 8800 GTS 640MB graphics card. Would it be better to use the PCI EXPRESS cable instead of using 2 of the 12V rails into the adapter?
    
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post #2 of 9
Quote:
Originally Posted by Core2DoOH! View Post
I have the seasonic M-12 700W. Currently I have 2 of the 12V into the adapter for my 8800 GTS 640MB graphics card. Would it be better to use the PCI EXPRESS cable instead of using 2 of the 12V rails into the adapter?
So you're using the dual molex to PCI-E adapter, why?
No need, get rid of that cable clutter.
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post #3 of 9
Thread Starter 
yes, I am using that because I was worried about getting enough amps to my card. I am overclocking it now but still think the pci express cable might be ok?
    
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post #4 of 9
The M-12 700 has two non-modular pci-e cables that are hardwired, correct? Just use one of those, there is plenty of power to go around, that is what they are designed for.
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post #5 of 9
Quote:
Originally Posted by Core2DoOH! View Post
yes, I am using that because I was worried about getting enough amps to my card. I am overclocking it now but still think the pci express cable might be ok?
You shouldn't assume you're going to have a problem until you actually try something the right way first.

Just because you're using two different Molex's doesn't mean you're using two different "rails". All Molexes are actually on the same rail. The PCIe is actually on it's OWN rail. If anything, you're actually supplying LESS juice to the graphics card because each Molex only has one +12V wire, for a total of two, while a native PCIe connector uses three.

Please use the 6-pin PCIe connector the way God and Seasonic intended.
post #6 of 9
Also, the PCI-E 6-pin can carry more +12v than two molex connectors anyway.

The 6-pin connector on the video card only accepts +12v, and each molex only has a single +12v wire. The 6-pin connector has three +12v wires.
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post #7 of 9
Quote:
Originally Posted by shinji2k View Post
The M-12 700 has two non-modular pci-e cables that are hardwired, correct?
They're modular, like peripheral cables.

Quote:
Originally Posted by jonnyGURU View Post
You shouldn't assume you're going to have a problem until you actually try something the right way first.
Yep, while there's no reason for making things simpler than necessary there's definitely no reason for making them more complex than that.
Quote:
Please use the 6-pin PCIe connector the way God and Seasonic intended.
+ PCI-SIG and hardware manufacturers.

But as far as Seasonic made PSUs are considered "multiple" rails can be skipped, I don't think anyone has found any evidence of those artificial current limitations going further than print on sticker for fulfilling needs of induced epidemic... er, fashion.
post #8 of 9
I was looking at pictures and the ones on newegg showed only one pci-e plug per cable so I assumed the other two were hardwired, turns out newegg used the same picture as the 500w model . So yes you are correct about 2 pci-e per cable even though I'd rather have two hardwired instead of 2 per cable anyways.
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post #9 of 9
Thread Starter 
Ok, I plugged up the PCI-E into the top PCI-E slot on my power supply. It wasn't supplying enough juice and crapped out on me several times. I am wondering if my PCI-E on my power supply is connected to one or more of the 12v rails I am already using for the hard drives and what not.

I even looked at the manual but cannot find out if the PCI-E and the other 12V rails are shared. Anyways, this all was fine until I got a new tower (antec 900 with 6 fans) with one huge 200mm fan. Dude, I promise I tried to set as many things independently, but have to be using one of the rails with too many things like fans or hard drives.

I know it will just take some messing around with as I have 3 hard drives on 1 rail now and maybe that is the same rail as what is going to the PCI-E. Someone mentioned that the PCI-E is separate? Are you sure about this? I have the 8800GTS 640MB and it takes 30 amps so maybe just having 1 PCI-E isnt enough? So I thought I could connect both PCI-E out of my power supply to the one slot on my card? I have the PCI-E cable with 2 pci-e on one end and 1 on the other. I don't think it works like that though and may have to go back to the adapter? I think my pci-e is just supplying 18 amps and that isn't cutting it with the 1 connector.

Does anyone else have an 8800 GTS and this power supply successfully hooked up to 1 PCI-E cable?
Edited by Core2DoOH! - 5/28/08 at 1:08am
    
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