Page 1 of 3 123 LastLast
Results 1 to 10 of 21

Thread: 1080Ti and Corsair HX850; Can One Cable Cope?

  1. #1
    Join Date
    Feb 2018
    Location
    UK
    Posts
    9
    Thanks Thanks Given 
    9
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default 1080Ti and Corsair HX850; Can One Cable Cope?

    Hi

    I am building a Gaming Rig with a Geforce 1080Ti Aorus 11GB (two 8 pin PCIE power connectors) and a Corsair HX850 Platinum that comes with the Corsair Type 4 PCIE cables which have two 8 pin PCIE ends.

    The TDP of the card is 250W. Research shows that the card can draw 250W gaming closer to 300W if overclocked, which it is in default.

    So assuming the card is drawing 300W and 60W of that is from the PCIE slot that leaves the cable(s) to provide 240W.

    So I have a choice:

    1) Use a single cable with its additional 8 pin male end.
    2) Use two cables not using the second 8 pin male end on each cable.


    Question 1

    Should I go for Option 1) or Option 2)?

    So if I use a single cable, that one cable may have to cope with 240 Watts continuous which is 20 Amps at 12 Volts. That seems a lot to me, especially when only three of the eight wires in the cable are +12V meaning they are taking 80W each (nearly 7 Amps each!).

    Are these Corsair Type 4 cables rated for that draw?

    If anyone knows how many watts/amps they are rated for that would be great?

    Question 2

    I intend to use the multiple rail (protected at 40W per cable) if using a single cable. But if using two cables should I go to single rail (70.8A max)?

    Thanks

  2. #2
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    15,865
    Thanks Thanks Given 
    525
    Thanks Thanks Received 
    179
    Thanked in
    129 Posts

    Default

    Yes.

  3. The Following User Says Thank You to Jon Gerow For This Useful Post:

    noledge (02-22-2018)

  4. #3
    Join Date
    Jul 2009
    Location
    Germany
    Posts
    3,530
    Thanks Thanks Given 
    6
    Thanks Thanks Received 
    34
    Thanked in
    31 Posts

    Default

    2)

    Because you have a high power card and the efficiency, drop and risk is lower with two cables.

  5. The Following User Says Thank You to Stefan Payne For This Useful Post:

    noledge (02-22-2018)

  6. #4
    Join Date
    Feb 2018
    Location
    UK
    Posts
    9
    Thanks Thanks Given 
    9
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Thanks for that. So one cable can cope but two would be better?

    Jonny do you have a feel for the wattage the Corsair Type 6 cables can take?

    Thing is if I go two cables I don't benefit from the 40 Amp OCP on each line but two cables seems more comfortable based on my calcs to take the load, I say that but I can't find how the cables are rated.....

    Guessing if I went two cables and left it on multi it would be subject to maximum OCP of the unit ie 70.8 Amps anyway?

    Would appreciate a bit of detail on this guys please.......... not sure which way to go

  7. #5
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    15,865
    Thanks Thanks Given 
    525
    Thanks Thanks Received 
    179
    Thanked in
    129 Posts

    Default

    Type 6 cable?

    The Corsair cables should support 225W w/o issue.

  8. #6
    Join Date
    Feb 2018
    Location
    UK
    Posts
    9
    Thanks Thanks Given 
    9
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Sorry, my mistake Jonny, Type 4 PCIE as I mentioned originally.

    As you say they should take 225W but if my calcs are correct we could be looking at 240W continuous?

  9. #7
    Join Date
    Nov 2006
    Location
    Slovenia
    Posts
    88
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Default

    Are you building a gaming rig or a mining rig? Because with gaming continuous max load is impossible.
    R7 1700x @3,95
    Geil EVO x 16gb ddr4 3200
    Asus Prime x370 pro
    Vega 64
    500GB Samsung 970 pro
    Corsair RM1000i
    EKWB watercooling (cpu+gpu)

  10. #8
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    15,865
    Thanks Thanks Given 
    525
    Thanks Thanks Received 
    179
    Thanked in
    129 Posts

    Default

    Quote Originally Posted by noledge View Post
    Sorry, my mistake Jonny, Type 4 PCIE as I mentioned originally.

    As you say they should take 225W but if my calcs are correct we could be looking at 240W continuous?
    Your card gets power from the PCIe slot as well. Upwards of 75W.

  11. The Following User Says Thank You to Jon Gerow For This Useful Post:

    noledge (02-22-2018)

  12. #9
    Join Date
    Feb 2018
    Location
    UK
    Posts
    9
    Thanks Thanks Given 
    9
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    This is deffo a gaming rig Strum, see here for 300W measured:

    https://www.pcper.com/image/view/793...n=node%2F67284

    I was figuring 60W from the PCIE Jonny but bow to your knowledge on this, isn't 300W -75W = 225W too close for a lead rated around 225W? Surely never a good idea to run a lead at or around its Max Rating?

  13. #10
    Join Date
    Nov 2006
    Location
    Slovenia
    Posts
    88
    Thanks Thanks Given 
    8
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Default

    Yes and look at the timescale
    During gaming power consumption usually fluctuates quite a bit, so this load isn't really continuous, as is during mining, which is known to cause problems:
    http://www.jonnyguru.com/forums/showthread.php?t=15364
    R7 1700x @3,95
    Geil EVO x 16gb ddr4 3200
    Asus Prime x370 pro
    Vega 64
    500GB Samsung 970 pro
    Corsair RM1000i
    EKWB watercooling (cpu+gpu)

  14. The Following User Says Thank You to strumf666 For This Useful Post:

    noledge (02-22-2018)

Similar Threads

  1. Is my Corsair TX550 power supply enough for a 1080ti?
    By jndtv2g in forum PC Power Supply Discussion
    Replies: 11
    Last Post: 05-02-2018, 07:20 AM
  2. Corsair HX650 vs HX850
    By insz in forum PC Power Supply Discussion
    Replies: 5
    Last Post: 08-16-2010, 08:41 PM
  3. Corsair HX850 Review
    By Oklahoma Wolf in forum PC Power Supply Discussion
    Replies: 47
    Last Post: 10-08-2009, 11:01 PM
  4. Corsair HX850 for under $170 from Dell
    By HOOfan_1 in forum Hot Deals
    Replies: 1
    Last Post: 07-09-2009, 02:42 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •