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Thread: Nvidia 6800 & dual Molex

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    Nvidia 6800 & dual Molex

    Apparently the new 6800 needs two seperate leads going to it's twin molex connectors. They say not too use a Y lead (which makes sense considering they put two molex cons onboard) but surely the PSU does not have seperate circuits for each lead. Ie each lead's wires are connected to the same voltage rails inside the PSU. In whcih case why two seperate leads?
    Surely this cant be because of the power limitations of the cable. Are they saying the cable would possibly melt if you used a Y lead?

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    no, they're saying that one molex line simply cannot provide sufficient juice - power needs to be uncontended, I'd guess.

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    Senior Member SilentDeath's Avatar
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    One molex connector is plenty (30A at 12v is a LOT! 30A at 5v is also a lot, cards wont take that much!) and if the next card i get (which will be an ati) has one of them on it ill unsodler the second and join the two together if there not conencted on the pcb.

    what I think *WILL* cause a lot of problems is the start up current these cards will require as when pc turns on everything wants a lot more than when its already running - could cause problems like with 9800 cards in shuttles (though simple 2 second time delay circuit fixes that)

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    ATi's R420 will very likely have two molex connectors aswell.

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    Quote Originally Posted by |SilentDeath|
    One molex connector is plenty (30A at 12v is a LOT! 30A at 5v is also a lot, cards wont take that much!)
    Yeah thats what i thought. But then why put two on the board and tell you to use two seperate leads? Doesn't make sense.

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    The second one is for the idiots who try to run the card on a rubbishrubbishrubbishrubbish psu.

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    Maybe the card needs 24/17/10 volts for some odd reason?
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    Is there any plan to increase the power output to cards from mobo's with the new PCI-X VGA slot ? Or is PSU connections to all future VGA cards ineviatable ?
    Desktop: AMD Athlon XP 2500+ Barton, 1024Mb PC-3200 TwinMOS w/Winbond, MSI K7N2 Delta-ILSR, Radeon 9800SE AIW, 40 GB 7,200 Rpm Hitachi Deskstar, 120GB 7,200 Rpm 8mb Cache Maxtor Diamond 9, 160GB 7200 Rpm 8mb Cache Seagate 7200.7 SATA, Plextor 708A 8x DVD-RW, 550W PFC Q-tec PSU, Casetek 1019SM Silver Case, Camdridge Soundworks DTT2200 Speakers

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    Quote Originally Posted by Lexeus
    Is there any plan to increase the power output to cards from mobo's with the new PCI-X VGA slot ? Or is PSU connections to all future VGA cards ineviatable ?
    PCI Express x 16 (the graphics card one) will be able to provide more power than AGP.
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    How much more power? Just enough to power cards equivalent to the Radeon 9000Pro ? Or will it mean no need for extra power form PSU on the equivalent higher end cards too ?
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    Um, the 9000Pro doesn't need extra power connectors anyway.

    It's not a case of power as such, more a case of current. The motherboards can only handle so much amperage down those little copper tracks of theirs, so they need nice AWG24 wires to carry some of the load.
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    I said 9000Pro equivalent.
    Basicly the low level graphics section of the next generation of cards
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    I think I read the PCI-X will only require one connector.

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    Quote Originally Posted by LayZeh
    The second one is for the idiots who try to run the card on a rubbishrubbishrubbishrubbish psu.
    /claps

    feel the power of my 250w generic

    Is there any chance that the actual retail versions will be differnt with regard to the molex layout?

    These new cards already cot a fair bit before you factor in the cost of the new psu that many people will need.

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    Senior Member Kezzer's Avatar
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    Quote Originally Posted by Capt Doufos
    I think I read the PCI-X will only require one connector.
    PCI-X and PCI-Express are different.

    PCI-X = latest revision of PCI (iirc 64-bit)
    PCI-Express = the "new" bus type developed for use with graphics cards

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    Quote Originally Posted by LayZeh
    The second one is for the idiots who try to run the card on a rubbishrubbishrubbishrubbish psu.

    Its still bloody pointless at the psu end ALL of the 5v wires are conencted together. So are the 12v, so are the 3.3V. Using two wires does nothing but decrease the resistance of the cables (not enough to worry about anyway...) and also to half the required amperage down the cables ebcause it would be shared between them...

    Im confident ATI R420 will not have a stupid extra molex.

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