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Hot!Safe to connect GPU and Riser with dual 6+2pin to 8pin cable?

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TheFatCat10
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2018/01/10 09:03:44 (permalink)
Hey guys, this is my first time building a rig and I need some help. Right now I have 3 Nvidia 1070 ti GPUs hooked up to a EVGA superNova G3 1000w PSU. The GPUs are all connected directly to the PSU via 6+2pin to 8pin cables (assuming that’s what it’s called, please correct me if I’m wrong), but the risers are connected via Molex to SATA adapters. After reading about how dangerous the Molex to SATA adapatera can be, I’m looking for an alternative. I noticed that my PSU came with 3 dual 6+2pin to 8pin cables(again correct me if this is not what they are called) and I was wondering, if I buy new 6pin risers, can I safely use these dual cables to connect both the GPU and the riser? My thought was that I could connect one of the 6+2pins into the GPU as it requires 8 pins, the other 6+2pin into the riser (6pin riser so 2 pins would not be used) and the 8pin connector into the PSU. Each GPU/riser combo would get its own dual 6+2pin to 8pin cable, so no daisy chaining or overloading. Is this a safe way to go about things? I am overclocking a bit, but have the power set to 80% for each GPU.

If there is a better way to do this, I’m all up for suggestions!
#1

22 Replies Related Threads

    Sajin
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/10 09:16:43 (permalink)
    You'll most likely be fine as long as you stay below 288w on the cable.


    #2
    TheFatCat10
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/10 09:24:14 (permalink)
    Thanks for the reply! Is there a better way to go about this? I’m looking to make this as safe as I can.... the wife would be a little upset if I burned the house down lol.
    #3
    Sajin
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/10 11:04:07 (permalink)
    Yes, buy a smaller psu just for the risers.


    #4
    TheFatCat10
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/11 19:33:17 (permalink)
    What if instead of connecting the riser and GPU together, I just daisy chain 2 risers at a time with the same dual 6+2pin to 8pin cables, or I daisy chained 2 GPUS, would that be any safer? I’ve looked around online and there is very limited info on this kinda set up.
    #5
    TheFatCat10
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/11 19:33:17 (permalink)
    What if instead of connecting the riser and GPU together, I just daisy chain 2 risers at a time with the same dual 6+2pin to 8pin cables, or I daisy chained 2 GPUS, would that be any safer? I’ve looked around online and there is very limited info on this kinda set up.
    #6
    Chris21010
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/11 20:16:51 (permalink)
    using splitters are the quickest way of overloading your cables and burning up stuff. as it makes to very easy to overload the cables themselves, avoid using them if it at all possible.


    #7
    TheFatCat10
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/11 20:20:59 (permalink)
    Chris21010
    using splitters are the quickest way of overloading your cables and burning up stuff. as it makes to very easy to overload the cables themselves, avoid using them if it at all possible.


    Is this still the case when using the dual 6+2pin to 8pin that came with the PSU? If so, why would they include it, if it wasn’t meant to be used? Genuinely asking.
    #8
    Chris21010
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/12 08:10:15 (permalink)
    if you are talking about the modular cables that plug into the power supply, those are fine. those cables are also all male ends so you can not chain then together and over load them. now GPU's do tend to come with dual 6pin to 8pin power, but the two 6pin are female and the 8pin is male. if you are buying a 6pin or 8pin female to dual male then this is what i was talking about and should be avoided. as you are possibly doubling the power that the cables were designed to handle safely.


    #9
    TheFatCat10
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/12 12:23:10 (permalink)
    Yes, I am talking about the cable that comes with the power supply that are all male. the cable has the one end that is 8pin and plugs into the PSU and the other end splits off into two separate 6+2pin connectors. I just want to take each of those 6+2 ends and plug them into either 2 separate GPUs or 2 Separate risers. From the sounds of it, this seems to be ok to do.
    #10
    Chris21010
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/12 13:00:10 (permalink)
    yes, that is fine. the only thing i would make sure of is if you are using multiple power supplies that you have the board and all the risers on the same power supply, and if there is space left add gpu's. just do not have two power supplies powering a single device.


    #11
    Chris21010
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/12 13:00:10 (permalink)
    .


    #12
    QuintLeo
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/12 16:03:45 (permalink)
    Switch to risers that have a MOLEX connector on the riser, is the easiest SAFE solution.
    Splitting out the PCI-E connectors to connect to risers with a PCI-E connector on the riser works too, if the splitters are high quality and you don't overload the connection to the PS.
     

    I am no longer the friendly FAH competition - thank Vorsholk and his ABUSE of his Curecoin developer position for that.
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    #13
    NvidiaFiend
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/17 21:45:28 (permalink)
    I've been using molex risers for my rig but I've set friends up with these cables using 6pin risers on their 6gpu rigs no problem (running 4months no hiccups).

    Got a used >=8gb GPU that you'd like to sell? PM me
    #14
    ipkha
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/18 08:15:50 (permalink)
    As long as you're not adding splitters to your psu cables everything ought to work out just fine. Molex is not the best idea as it really isn't designed for high loads. Hard disks and the like that are generally powered off of them don't use anywhere close to 50-75 watts a card can draw off of the slot. While single rail designs mitigate this somewhat, using an entire Molex chain for risers can seriously overload the wiring and connector over time. The Molex setup just isn't designed for such high sustained loads.

    #15
    QuintLeo
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/18 11:59:15 (permalink)
    The "Molex" connector (actually AMP Mate-n-Lock) is a derivation of a different VERY SIMILAR connector that has been in widespread usage for many DECADES (longer than I've been alive) powering mobile 2-way radio gear at loads well in excess of 100 watts for some of those radios.
    The ONLY differences are that it uses pins for both +5V and +12V where the original supplied +12V on 2 of the 4 pins, and the shape was changed slightly to avoid any possibility of misconnections - the pins THEMSELVES are identical between the 2 connector styles.
     
     "Molex" computer connectors ARE in fact designed for high power loads by computer standards - they were overkill even for FULL HEIGHT 5.25" hard drives back in the day, and are SPECIFICALLY designed and rated to handle sustained loads.
     I don't remember if they were used on any 8" floppy or 8" hard drives offhand, but the 8" drives I actually used all had AC-driven motors to spin the platters and rather large multi-pin connectors for power.
     The pins THEMSELVES are designed for 13 amps PER PIN - that works out to 156 watts per connector of +12VDC, which is generally more than the wiring on the chain is rated to supply.
     A PCI-E 6-pin connector with 2 actual +12V power leads and the third +12V connector not used or used as a SENSE lead (fairly common) is only rated for 192 watts, not exactly THAT big of a difference - both are overkill for powering a riser.
     
     Putting more than one riser on a Molex chain CAN be problematic because the WIRING is not normally sized for the load, the CONNECTOR is not an issue.
     
     Compare this to the SATA power connector, which is only rated for 54 watts MAX of +12VDC while the PCI-E bus is rated to handle 75 AND THE RISER ITSELF will use a few more watts in it's "voltage conversion" circuitry.
     

    I am no longer the friendly FAH competition - thank Vorsholk and his ABUSE of his Curecoin developer position for that.
     I no longer MOO due to abuses by certain "whales" in the Gridcoin community - so I now work the Distributed.net project directly again.
     
    #16
    NvidiaFiend
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/18 12:06:48 (permalink)
    QuintLeo
    The "Molex" connector (actually AMP Mate-n-Lock) is a derivation of a different VERY SIMILAR connector that has been in widespread usage for many DECADES (longer than I've been alive) powering mobile 2-way radio gear at loads well in excess of 100 watts for some of those radios.
    The ONLY differences are that it uses pins for both +5V and +12V where the original supplied +12V on 2 of the 4 pins, and the shape was changed slightly to avoid any possibility of misconnections - the pins THEMSELVES are identical between the 2 connector styles.
     
     "Molex" computer connectors ARE in fact designed for high power loads by computer standards - they were overkill even for FULL HEIGHT 5.25" hard drives back in the day, and are SPECIFICALLY designed and rated to handle sustained loads.
     I don't remember if they were used on any 8" floppy or 8" hard drives offhand, but the 8" drives I actually used all had AC-driven motors to spin the platters and rather large multi-pin connectors for power.
     The pins THEMSELVES are designed for 13 amps PER PIN - that works out to 156 watts per connector of +12VDC, which is generally more than the wiring on the chain is rated to supply.
     A PCI-E 6-pin connector with 2 actual +12V power leads and the third +12V connector not used or used as a SENSE lead (fairly common) is only rated for 192 watts, not exactly THAT big of a difference - both are overkill for powering a riser.
     
     Putting more than one riser on a Molex chain CAN be problematic because the WIRING is not normally sized for the load, the CONNECTOR is not an issue.
     
     Compare this to the SATA power connector, which is only rated for 54 watts MAX of +12VDC while the PCI-E bus is rated to handle 75 AND THE RISER ITSELF will use a few more watts in it's "voltage conversion" circuitry.
     


    This is the best explanation of molex superiority. But I'm not really sure how much better molex is than using a male 8pin to 2 6pin + 2pin. I haven't looked into results between mine and my friends.

    Got a used >=8gb GPU that you'd like to sell? PM me
    #17
    QuintLeo
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/18 12:19:11 (permalink)
    It's not that MOLEX is better than PCI-E 6-pin for powering a riser - they both work fine and can be safe to use.
    It's that I already HAVE the unused MOLEX connectors without having to add splitters, and the available ports on the power supplies.
     
    It also spreads the load some among the power connectors on the PS side, instead of concentrating the load on the VGA connectors, which helps things run a little cooler.
     

    I am no longer the friendly FAH competition - thank Vorsholk and his ABUSE of his Curecoin developer position for that.
     I no longer MOO due to abuses by certain "whales" in the Gridcoin community - so I now work the Distributed.net project directly again.
     
    #18
    Noxnoctis1976
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/29 08:49:53 (permalink)
    Great info! Anyone have a recommend brand for PS?
    #19
    EchofoxtrotFTW
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/29 09:15:59 (permalink)
    agreed stay away from the splitters
    #20
    QuintLeo
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/29 16:55:39 (permalink)
    The bulk of my rigs are running Seasonic X-series (Gold) or SS-series (Platinum) power supplies.
    A few run EVGA G2 series supplies - equal quality IMO but fewer ports on the PS side make them harder to us for setting up 5+ card rigs.
    I am considering the Corsair AX series for future builds, as Seasonic no longer makes their X or SS series supplies, while the AX series (NOT the AX (i) series) are a Seasonic-built "clone" of the SS series.
    I'm not sure if the EVGA G2/P2/T2 series is still in production or not - I get the impression EVGA had Superflower shut the line down at one point, only to get a lot of "we don't want that G3/P3/T3 thing, we want the G2/P2/T2" demand and ended up having at least limited production started back up.
     
     I specifically recommend AGAINST the EVGA G3/P3/T3 line AND against the current Seasonic Prime/Focus lines due to their use of a "fancy name" SLEEVE BEARING FAN that is not going to last in a long-term 24/7 high load mining environment.
     The G2/P2/T2 and X/SS lines all used BALL BEARING fans that DO last a long time at high RPM when the power supply is consistantly at a high load factor 24/7.
     
     I am certain that both EVGA and Seasonic are going to end up doing a TON of repairs on their new lines a few years down the road, due to FAN FAILURES that cause the PS to overheat and completely fail.
     

    I am no longer the friendly FAH competition - thank Vorsholk and his ABUSE of his Curecoin developer position for that.
     I no longer MOO due to abuses by certain "whales" in the Gridcoin community - so I now work the Distributed.net project directly again.
     
    #21
    ipkha
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/30 04:27:03 (permalink)
    The evga platinum series use ball bearing fans. Titanium as well. Only gold and below use sleeve fans.

    #22
    QuintLeo
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    Re: Safe to connect GPU and Riser with dual 6+2pin to 8pin cable? 2018/01/30 12:02:59 (permalink)
    ALL of the G2/P2/T2 variations use ball bearing.
     
     *BUT*
     
     After digging through listings on HERE, it seems that EVGA may no longer be selling the G3 series supplies as THERE ARE NONE LISTED whatsoever on the site!
     
     I also am finding nothing indicating they EVER made a platinum or titanium version of the G3 line - I THOUGHT they did, but it appears they may never have moved past the Gold version.
     
     Keep in mind that the G3 is NOT the same Superflower made power supply series that the G2/P2/T2 are - different manufacturer, completely different design from the G2/P2/T2 line.
     
    post edited by QuintLeo - 2018/01/30 12:12:15

    I am no longer the friendly FAH competition - thank Vorsholk and his ABUSE of his Curecoin developer position for that.
     I no longer MOO due to abuses by certain "whales" in the Gridcoin community - so I now work the Distributed.net project directly again.
     
    #23
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