Page 1 of 2 12 LastLast
Results 1 to 10 of 20

Thread: Determining max continuous load of PSU for mining rig

  1. #1
    Join Date
    Jul 2017
    Location
    Latvia
    Posts
    9
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default Determining max continuous load of PSU for mining rig

    For one mining rig with 8 rx580 cards I did purchase Corsair HX1200 Platinum 1200W PSU. My experience shows that such rig with properly modified bioses for the cards will drain 1100w from the wall. Which could mean that 1200w PSU be OK. But seems that I have been wrong because my rig truly draws 1100w from wall (wattmeter data from several devices) and it shuts down after 10 minutes of full load. Discussing this with my mates I got blamed for such misuse of PSU, because I never should exceed 80% from... I don't know actually which number do they think - psu raiting? 12v rail total power?
    So I would like to understand how to determine max safe continuous load for PSUs in context of GPU mining.
    Other PSUs at same conditions would work fine and I have such experince. But maybe I am wrong and I am misusing my PSUs and all of them will die in terrible death because of my stupidity.
    So - questions here are.
    1) What is and how to calculate max safe continuous load of PSU for GPU mining.
    2) Is my corsair HX1200 defective if it shuts down on continuous load of 1100w from wall after 10 minutes?
    Last edited by deff_ins; 02-18-2018 at 06:32 AM.

  2. #2
    Join Date
    Aug 2014
    Posts
    934
    Thanks Thanks Given 
    314
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    1) Max safe continous load is the wattage rating on the label. In this case, it's 1200W.
    2) You should troubleshoot the graphics cards first, as those are the ones that are most likely to fail under 100% load all the time. It could also be a bad connection or something with the motherboard and how you connected the power cables.

  3. #3
    Join Date
    Jul 2017
    Location
    Latvia
    Posts
    9
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Risers could be weak spot in system as they usually are bad quality. Ill try reaseat everything and replace all risers then.

  4. #4
    Join Date
    Oct 2006
    Location
    Moderator
    Posts
    6,501
    Thanks Thanks Given 
    144
    Thanks Thanks Received 
    2
    Thanked in
    1 Post

    Default

    Does it run with seven cards? If so, does it matter which cards?

  5. #5
    Join Date
    Oct 2017
    Location
    Grand Junction, CO
    Posts
    1,514
    Thanks Thanks Given 
    55
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Default

    At highish load, the efficiency of the HX1200 is about 93% (on 230V), so if the wall load is 1,100W, the output is 1,023W; which means you have it running at about 85% maximum load.

    I assume the room is rather hot from this work, and that might be why your buddies are suggesting it needs de-rating.

    You could try opening up the room to the Winter cold as an experiment, although I am sure this extra heat is normally welcome and not to be wasted.
    Attached Images Attached Images
    Last edited by ashiekh; 02-18-2018 at 05:13 PM.

  6. #6
    Join Date
    Jun 2010
    Location
    The Netherlands
    Posts
    5,040
    Thanks Thanks Given 
    363
    Thanks Thanks Received 
    6
    Thanked in
    6 Posts

    Default

    How exactly is everything connected?

    The PSU doesn't care about the load by the way, it's a good 1200W PSU. Good power supplies are always build for full power, only the crappy ones aren't.

  7. #7
    Join Date
    Jul 2017
    Location
    Latvia
    Posts
    9
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Well, Ill try to describe it.
    Each card has one 8 pin connector, there are 4 cables for pcie, each has 2 connectors, so each card has one. All cars are almost the same, 5x580+3x570. 580 draws 110w (gpuz, hwinfo data) and 570 draws around 90w.
    Motherboard: ASUS Z270F
    CPU: G4400
    No mining or overclocking on CPU.
    There are 8 risers, each 2 risers connected to one sata cable. I don't even know what else to mention here. But I got the point, PSU should work on 1100w load.
    Ill just test rig with new risers and reseat all cables.
    I had plan to add there secondary PSU so I could boost my card to full load and start dual mining on Claymore software.
    Question is - where can i learn about PSU - I would like to find argument that states that PSUs are designed to work on full load.

  8. #8
    Join Date
    Oct 2017
    Location
    Grand Junction, CO
    Posts
    1,514
    Thanks Thanks Given 
    55
    Thanks Thanks Received 
    1
    Thanked in
    1 Post

    Default

    Quote Originally Posted by deff_ins View Post
    I would like to find argument that states that PSUs are designed to work on full load.
    They need to be derated for high temperature input; i.e. cannot run at full load.

    http://www.jonnyguru.com/forums/showthread.php?t=3987

    "How does the temperature inside of my case affect the performance of my power supply?

    Power supplies can perform differently depending on the temperature at which they are operating at. When a power supply is rated for it's total output wattage, it is rated to do so at a particular temperature. Anything beyond this temperature may take away from the power supply's capability. A power supply that is rated to put out 550W at 25°C or 30°C (room temperature) may only be able to put out 75% of that at 40°C or 50°C (actual operating temperature). This difference is called the "de-rating curve". A normal operating temperature for a power supply is 40°C.

    jonnyGURU, Mar 19, 2008"
    Last edited by jonnyGURU; 02-20-2018 at 02:03 AM.

  9. #9
    Join Date
    Oct 2006
    Location
    Moderator
    Posts
    6,501
    Thanks Thanks Given 
    144
    Thanks Thanks Received 
    2
    Thanked in
    1 Post

    Default

    Quote Originally Posted by deff_ins View Post
    There are 8 risers, each 2 risers connected to one sata cable.
    You should be using risers with PCIe connectors only - SATA connectors cannot handle the load those cards require from the PCIe slot.

  10. #10
    Join Date
    Jul 2017
    Location
    Latvia
    Posts
    9
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Quote Originally Posted by Oklahoma Wolf View Post
    You should be using risers with PCIe connectors only - SATA connectors cannot handle the load those cards require from the PCIe slot.
    Are you suggesting to use pcie splitters?

Similar Threads

  1. I need help determining if my ram needs replacing.
    By irfanjadhav in forum General PC Hardware
    Replies: 2
    Last Post: 09-21-2018, 03:25 AM
  2. Modding ATX PSU to Continuous PS
    By jimc5252 in forum PC Power Supply Discussion
    Replies: 4
    Last Post: 10-06-2016, 07:58 AM
  3. psu maximum continuous power
    By OZSA in forum PC Power Supply Discussion
    Replies: 7
    Last Post: 08-06-2016, 06:47 AM
  4. Help with determining OEM
    By McSteel in forum PC Power Supply Discussion
    Replies: 9
    Last Post: 11-22-2011, 11:46 AM
  5. Determining OEM platform
    By bungynik in forum PC Power Supply Discussion
    Replies: 65
    Last Post: 09-02-2010, 12:22 PM

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
  •