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Splitting GPU power cables

post #1 of 7
Thread Starter 
Hey everybody I was just wondering if you decrease performance by using those supplementary 8 pin power splitter cables that come with graphics cards?
You know the ones I mean they split one 8 pin cable into 2.
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post #2 of 7
The molex to PCI-e power connectors won't affect performance provided you have the required wattage to run the card in the first place if that's what you were asking
post #3 of 7
they are just power cable adapters...
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post #4 of 7
Thread Starter 
Thinking of getting another 590 but don't have enough 8 pin power cables. so I was going to use those cables that split one modular 8 pin power cable into two 8 pins.
Probably won't be enough power for both but I was going to try it before getting another psu.
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XSPC Raystorm Copper edition  XSPC RIVE Chipset and VRM block  3 X XSPC RAZOR Titan Blocks and Backplates  2 X Alphacool D5 pumps  
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Bitspower Dual pump Top  2 X Alphacool UT60 480 Radiators  1 X Alphacool XT45 240 Radiator  Phobya Balancer 250 Black Nickel  
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post #5 of 7
Quote:
Originally Posted by Bloodbath View Post
Thinking of getting another 590 but don't have enough 8 pin power cables. so I was going to use those cables that split one modular 8 pin power cable into two 8 pins.
Probably won't be enough power for both but I was going to try it before getting another psu.
1000 watts is FAR more than enough for two 590s.
post #6 of 7
It won't affect performance as long as your cards are getting enough juice from the connection. You have to find out how many amps are on the 12v rail and how much your card needs.
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post #7 of 7
Basically any electrical wire can carry as much power across it as is 'requested' by the device. The only concern is whether or not the wire becomes overloaded by the draw. The thicker the wiring, the more amperage you can safely put through it.

Also, there's the PSU's over-current protection circuitry you have to worry about tripping (esp. if you have a multi-rail unit, which means it has OCP circuits on different groups of wires).

Basically as long as your PSU doesn't shut off, your cards will be getting all the juice they need. Just make sure the wires don't get too hot from the load you're pulling through them. If you are pulling too much power, you'll find out from the smell of the casing around them melting (however that's HIGHLY unlikely)

And in case you haven't deduced the answer ... no, you can't reduce performance by using the splitters. Your video card will either work perfect ... or the PSU will (harmlessly) shut down ... or the wires will melt. Those are all the options
Edited by brettjv - 10/22/11 at 1:02am
    
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