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Quick Question About Power Connectors...

post #1 of 8
Thread Starter 
Just picked up some 7950s which will be run in crossfire on my PC (2 x 7950s).

Each card has 2 x 6-pin power. My PSU is modular, so I went to grab some extra PCIE connectors to give the cards the required power. When I opened up my bag of connectors, all the 6-pin modular cables were 6-pin to molex.

The only option I'm left with is the 6-pin connectors that aren't modular. There is one cable in particular that has TWO 6-pin connectors in series. Can/should I hook these up to both cards or will I draw too much power from a single cable?

Any recommended PSU for 2 x 7950s? I find it kind of silly that this PSU will power like 12 molex devices but only a few PCIe..

Thanks.
    
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post #2 of 8
If the cable has 2 6pin connectors in series, then it was likely meant specifically for a gpu like yours and will work fine.

I'm not exactly sure what you mean with the molex connectors. What PSU do you have?
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post #3 of 8
Quote:
Originally Posted by Lazorbeam View Post

Just picked up some 7950s which will be run in crossfire on my PC (2 x 7950s).

Each card has 2 x 6-pin power. My PSU is modular, so I went to grab some extra PCIE connectors to give the cards the required power. When I opened up my bag of connectors, all the 6-pin modular cables were 6-pin to molex.

The only option I'm left with is the 6-pin connectors that aren't modular. There is one cable in particular that has TWO 6-pin connectors in series. Can/should I hook these up to both cards or will I draw too much power from a single cable?

Any recommended PSU for 2 x 7950s? I find it kind of silly that this PSU will power like 12 molex devices but only a few PCIe..

Thanks.

Didn't the cards come with Molex to PCI-E adapters? If not you should try buying some of those connectors and test them out before going out and buying a new PSU. You should be able to get 2 7950s running on a 650W PSU.
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post #4 of 8
Quote:
Originally Posted by Fridge Gnome View Post

If the cable has 2 6pin connectors in series, then it was likely meant specifically for a gpu like yours and will work fine.

I'm not exactly sure what you mean with the molex connectors. What PSU do you have?

Some GPU comes with power cables that hookup to old drives 4-pin power connectors, just in case if your PSU is old and dont have 6-pins connectors.


OP: if it was coming from a single cable or multiple they will all draw from the same12v line inside your PSU.
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by Fridge Gnome View Post

If the cable has 2 6pin connectors in series, then it was likely meant specifically for a gpu like yours and will work fine.

I'm not exactly sure what you mean with the molex connectors. What PSU do you have?

This is the PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817371021

There is only 1 x 6-pin cable wired straight into the PSU. This one has 2 x 6-pin connectors on it. Is there a difference whether I hook both connectors to one card, or should I do one per card?

The other is a 6+2 pin modular connector. I wasn't using this one at all previously. When I opened up the bag of connectors that came with the PSU, the connector was a 6+2 pin PCIE to 4 pin molex. Weird.

Same thing for the 6-pin modular connector (wasn't using this one either). Cable is a 6-pin to molex.
Quote:
Originally Posted by EaquitasAbsum View Post

Didn't the cards come with Molex to PCI-E adapters? If not you should try buying some of those connectors and test them out before going out and buying a new PSU. You should be able to get 2 7950s running on a 650W PSU.

Not adapters per-say, but a whole bunch of PCIE to Molex cables. I could technically do 6-pin PCIE -> molex -> 6-pin PCIE.
    
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post #6 of 8
yeah you should be fine, you have the one cable with 2x 6 pin, and you have 2x6+2 pins,
it doesn't really matter which one you connect to which card, your PSU have only one 12v rail that all 12v draw from it.
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post #7 of 8
According to Antec you should have 2- 6pin and 2- 6+2 pin pcie connectors.
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by bigmac11 View Post

According to Antec you should have 2- 6pin and 2- 6+2 pin pcie connectors.

Back home now, and yes, I have two of each. They're paired up though - but folks in this thread cleared up my confusion about them and I hooked them up. Working like a charm!
    
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