Title: Power supply question... help needed. Post by: Servfox on January 03, 2018, 02:47:14 AM I'm planning a rig with 7 zotac gtx 1070 ti amp extremes. They require dual 8 pin power input. My original plan was to use 2 corsair (RM850x, 850W, Fully Modular Power Supply, 80+ Gold Certified).
However, that PSU only has 5 8-pin connections each. If I move up to the 1000w psu, it only has 6 8-pin connections. Do I use 6 pin to 8 pin adapters or do I need to upgrade to 1300w psu's with more peripherals? Thanks! Title: Re: Power supply question... help needed. Post by: Bakhtra on January 03, 2018, 03:06:57 AM I'm planning a rig with 7 zotac gtx 1070 ti amp extremes. They require dual 8 pin power input. My original plan was to use 2 corsair (RM850x, 850W, Fully Modular Power Supply, 80+ Gold Certified). Use adapter is enough for me. Just need to check the cable for 24 hours just to be sure that it not hot. If hot replug it again, till it really fit and not hot. Use good splitter.However, that PSU only has 5 8-pin connections each. If I move up to the 1000w psu, it only has 6 8-pin connections. Do I use 6 pin to 8 pin adapters or do I need to upgrade to 1300w psu's with more peripherals? Thanks! Title: Re: Power supply question... help needed. Post by: Servfox on January 03, 2018, 03:27:08 AM I'm planning a rig with 7 zotac gtx 1070 ti amp extremes. They require dual 8 pin power input. My original plan was to use 2 corsair (RM850x, 850W, Fully Modular Power Supply, 80+ Gold Certified). Use adapter is enough for me. Just need to check the cable for 24 hours just to be sure that it not hot. If hot replug it again, till it really fit and not hot. Use good splitter.However, that PSU only has 5 8-pin connections each. If I move up to the 1000w psu, it only has 6 8-pin connections. Do I use 6 pin to 8 pin adapters or do I need to upgrade to 1300w psu's with more peripherals? Thanks! Split 1 8pin cable into 2 8pin cables? Are there any safety or performance issues with the GPU when doing it this way? Title: Re: Power supply question... help needed. Post by: philipma1957 on January 03, 2018, 03:35:09 AM first choice is return the cards.
wait for second choice http://www.corsair.com/en-us/ax1500i-digital-atx-power-supply-1500-watt-fully-modular-psu-refurbished Title: Re: Power supply question... help needed. Post by: Bakhtra on January 03, 2018, 03:35:30 AM I'm planning a rig with 7 zotac gtx 1070 ti amp extremes. They require dual 8 pin power input. My original plan was to use 2 corsair (RM850x, 850W, Fully Modular Power Supply, 80+ Gold Certified). Use adapter is enough for me. Just need to check the cable for 24 hours just to be sure that it not hot. If hot replug it again, till it really fit and not hot. Use good splitter.However, that PSU only has 5 8-pin connections each. If I move up to the 1000w psu, it only has 6 8-pin connections. Do I use 6 pin to 8 pin adapters or do I need to upgrade to 1300w psu's with more peripherals? Thanks! Split 1 8pin cable into 2 8pin cables? Are there any safety or performance issues with the GPU when doing it this way? Oh I forgot to mention that I only mine cryptonight algo. Title: Re: Power supply question... help needed. Post by: philipma1957 on January 03, 2018, 03:38:24 AM @ op the refurbshed cosair 1500 watt works
it has 10 jacks use 9 for pcie and 1 for cpu I will link you to some pcie cables that fit it. or return the cards as 2x 8pin are less then ideal for 1070ti mining https://i.imgur.com/RnUWDzK.png Title: Re: Power supply question... help needed. Post by: Bakhtra on January 03, 2018, 03:41:57 AM @ op the refurbshed cosair 1500 watt works Best choice if you not in my country. In Indonesia, I still need to pay tax around 100-200 usd for that, and still need expensive shipping price.Title: Re: Power supply question... help needed. Post by: philipma1957 on January 03, 2018, 03:43:57 AM @ op the refurbshed cosair 1500 watt works Best choice if you not in my country. In Indonesia, I still need to pay tax around 100-200 usd for that, and still need expensive shipping price.if op can not buy that psu he should return those cards 2x eight pin for a 1070ti are less then ideal as he is finding out. Title: Re: Power supply question... help needed. Post by: Undefined31415 on January 03, 2018, 03:48:28 AM I'm planning a rig with 7 zotac gtx 1070 ti amp extremes. They require dual 8 pin power input. My original plan was to use 2 corsair (RM850x, 850W, Fully Modular Power Supply, 80+ Gold Certified). Use adapter is enough for me. Just need to check the cable for 24 hours just to be sure that it not hot. If hot replug it again, till it really fit and not hot. Use good splitter.However, that PSU only has 5 8-pin connections each. If I move up to the 1000w psu, it only has 6 8-pin connections. Do I use 6 pin to 8 pin adapters or do I need to upgrade to 1300w psu's with more peripherals? Thanks! Split 1 8pin cable into 2 8pin cables? Are there any safety or performance issues with the GPU when doing it this way? The 1070ti should definitely not need to make full use of both 8-pin connections. However, the use of splitters still isn't guaranteed to be safe (we don't know exactly how the card distributes the load between multiple onboard power connections + power through the PCIe slot), and checking the cable to see if it's hot won't guarantee stability, either. (An extremely hot cable can tell you there's a problem, but just because you don't feel it being too hot, doesn't mean that there's no problem.) You could, more than likely, get away with using 1x 6-pin to 1x 8-pin adapters, if you avoid exceeding one per line and per card. You could also use 2x 4-pin molex to PCIe adapters (also no more than one per line of connectors). SATA connectors are also an option, but one I would rank last. (Don't forget about powering risers.) You could also consider using 3x PSUs (too many points of failure for me) or look at other PSU options. Title: Re: Power supply question... help needed. Post by: Servfox on January 03, 2018, 04:01:26 AM @ op the refurbshed cosair 1500 watt works it has 10 jacks use 9 for pcie and 1 for cpu I will link you to some pcie cables that fit it. or return the cards as 2x 8pin are less then ideal for 1070ti mining https://i.imgur.com/RnUWDzK.png Hi Phillip, I can certainly buy this card if it is the only way to make the rig work. Just to be clear, are you saying that I need 2 of these corsair1500 watt psu's or 1 psu with some sort of adapters? I'd rather not return these cards. I could downgrade the rig to 6 cards and sell the 7th if that will make things easier for me. Title: Re: Power supply question... help needed. Post by: philipma1957 on January 03, 2018, 04:35:59 AM @ op the refurbshed cosair 1500 watt works it has 10 jacks use 9 for pcie and 1 for cpu I will link you to some pcie cables that fit it. or return the cards as 2x 8pin are less then ideal for 1070ti mining https://i.imgur.com/RnUWDzK.png Hi Phillip, I can certainly buy this card if it is the only way to make the rig work. Just to be clear, are you saying that I need 2 of these corsair1500 watt psu's or 1 psu with some sort of adapters? I'd rather not return these cards. I could downgrade the rig to 6 cards and sell the 7th if that will make things easier for me. It can do nine pcie cable each are oem and have two eight pin pcie jacks You can set tdp to 110 watts and 7 cards are easy peasy Let me find link for extra cables you need they are on Corsair website here are the cables single head 4.99 a cable dual head 6.99 a cable http://www.corsair.com/en-us/type-3-flat-black-ribbon-cable-pcie-6-2-pin-dual-connectors-compatible-with-all-type-3-pin-out-psu let me walk down to my corsair psu 1500 watters and be sure about this. okay it comes with 6 single head pcie cables and 2 twin head pcie cables so if you buy 5 twin head cables from the link above that gives you 7 twin head cables. the psu use type 3 and that is the link above. so 5 x 7 = 35 + 350 = 385 and you will have a safe setup using about 810 watts if you set tdp to 110 watts a card about 72% you could push to 125 watts a card and still be safe about 910 watts for the whole setup and only 125 watts on a 16 cable the dual head type 3 for $6.99 are what you want http://www.corsair.com/en-us/type-3-flat-black-ribbon-cable-pcie-6-2-pin-dual-connectors-compatible-with-all-type-3-pin-out-psu CP-8920129 reminds me I should order some Title: Re: Power supply question... help needed. Post by: Servfox on January 03, 2018, 05:34:59 AM @ op the refurbshed cosair 1500 watt works it has 10 jacks use 9 for pcie and 1 for cpu I will link you to some pcie cables that fit it. or return the cards as 2x 8pin are less then ideal for 1070ti mining Hi Phillip, I can certainly buy this card if it is the only way to make the rig work. Just to be clear, are you saying that I need 2 of these corsair1500 watt psu's or 1 psu with some sort of adapters? I'd rather not return these cards. I could downgrade the rig to 6 cards and sell the 7th if that will make things easier for me. It can do nine pcie cable each are oem and have two eight pin pcie jacks You can set tdp to 110 watts and 7 cards are easy peasy Let me find link for extra cables you need they are on Corsair website here are the cables single head 4.99 a cable dual head 6.99 a cable http://www.corsair.com/en-us/type-3-flat-black-ribbon-cable-pcie-6-2-pin-dual-connectors-compatible-with-all-type-3-pin-out-psu let me walk down to my corsair psu 1500 watters and be sure about this. okay it comes with 6 single head pcie cables and 2 twin head pcie cables so if you buy 5 twin head cables from the link above that gives you 7 twin head cables. the psu use type 3 and that is the link above. so 5 x 7 = 35 + 350 = 385 and you will have a safe setup using about 810 watts if you set tdp to 110 watts a card about 72% you could push to 125 watts a card and still be safe about 910 watts for the whole setup and only 125 watts on a 16 cable the dual head type 3 for $6.99 are what you want http://www.corsair.com/en-us/type-3-flat-black-ribbon-cable-pcie-6-2-pin-dual-connectors-compatible-with-all-type-3-pin-out-psu CP-8920129 reminds me I should order some Phillip, I can't thank you enough for helping me out with this. Lesson learned on the dual power input cards. I'm trying to find a new Corsair ax1500i (10 year warranty vs 1 year warranty for the refurbished one). I found one in Canada if I can convince them to ship to New Jersey! If not I'll grab the refurbished one. Thanks again! Title: Re: Power supply question... help needed. Post by: philipma1957 on January 03, 2018, 07:50:40 PM No worries.
On Nvidia this chart covers most but not all cards. 1080 ti you need 8 + 6 pin don't buy 1080 ti's with 2x 8 pin and you can go to 200 watts or 80% tdp with one good cable 1080 you need 8 pin don't buy 1080 with 2 jacks and you can do 150 watts or 83% tdp with one good cable 1070 ti you need 8 pin don't buy 1070ti with 2 jack and you can do 125 watts or 83% with one good cable 1070 you need 8 pin don't buy 1070 with 2 jack and you can do 125 watts or 83% with one good cable the cosair ax1500i has 10 pcie /cpu jacks use up to 9 twin head pci-e cables at 130 watts each Title: Re: Power supply question... help needed. Post by: equasar on January 03, 2018, 09:11:53 PM Get some Server PSUs.
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