Power supply question... help needed.

[Servfox]

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!

[Bakhtra]

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!

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.

[Servfox]

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!

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.

Split 1 8pin cable into 2 8pin cables? Are there any safety or performance issues with the GPU when doing it this way?

[philipma1957]

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

[Bakhtra]

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!

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.

Split 1 8pin cable into 2 8pin cables? Are there any safety or performance issues with the GPU when doing it this way?

Actually I only use RED GPU, I use rm1000x for 7 GPU, it got PCIE Cables 4 x [(6+2)x2], 1 cable for 2 RX 5xx/4xx and its already months with no issue (no performance loss). I only need to check it for 1st 24 hours, and issues maybe on sata cable to riser (sometimes hot>>need to replug) and after 24 hours if not hot. It will stay like that for months. Of course I keep checking it for each week.
Oh I forgot to mention that I only mine cryptonight algo.

[philipma1957]

@ 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

[Bakhtra]

@ 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.

[philipma1957]

@ 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.

[Undefined31415]

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!

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.

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.

[Servfox]

@ 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.

[philipma1957]

@ 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
  http://www.corsair.com/en-us/type-3-sleeved-black-pci-e-pig-tail-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

[Servfox]

@ 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
  http://www.corsair.com/en-us/type-3-sleeved-black-pci-e-pig-tail-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!

[philipma1957]

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

[equasar]

Get some Server PSUs.