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  1. #1
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    Dell Precision 690 1000W PSU to MATX board?

    I bought this power supply since when u add 5 12v rails at 18A each we see 1,100 watts.

    Anyway the pinout on the 24-pin and 20-pin are different than standard power supplies. What's the standard?

    I can't power it on since the green wire is in a different pin location than standard atx power supplies.

    If anyone can help me get this thing working on a standard matx board with 1 4-pin and 1 24-pin that would be great!

    Thanks
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  2. #2
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    Re: Dell Precision 690 1000W PSU to MATX board?

    atx psu pinout pics

    not sure if i want to encourage you to attempt it though.

    ud

  3. #3
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    Re: Dell Precision 690 1000W PSU to MATX board?

    I bought this power supply since when u add 5 12v rails at 18A each we see 1,100 watts.
    Trying to send that matx board into orbit?

    PS The notation means each rail is capable of 18 amps, all rails will not supply 5x18, the limit should be listed in the line under the individual rail specs ie.
    12v1 12v2 12v3 12v4 12v5
    18a 18a 18a 18a 18a
    -------------------------------------------
    950(appx) w max
    PPS you need to know what each line is connected to to use max unless there is just one rail with an18a limit on the wiring.

    You can use small screw driver to release the sockets and re arrange per the atx 24 pin standard
    If you want to use the 4-pin take off 2 separate molex lines (yellow 12v, and black grnd)
    Last edited by TheGlasMan; 06-07-2014 at 06:22 PM.


    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

  4. #4
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    Re: Dell Precision 690 1000W PSU to MATX board?

    Cool thanks! I re-did the harness and it powers up with p1 connected but i wired in the grounds, 12v rails, 5v, and 3.3v with the 20 pin P2 which it didn't seem happy.

    I'll have to test further so I need to re-do the harness and not use P2 at all?

    Thanks

  5. #5
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    Re: Dell Precision 690 1000W PSU to MATX board?

    I would think you would have a 24 pin connectors as 20 pins are obsolete (well at least OLD).

    If the Dell wires have different colors then use a Volt Ohm Meter (20 bucks) to determine the voltages of each color.

    The only difference between the 20 pin connector and the 24 pin is the 11, 12, 23,and 24 pins. The extra pin slots 12v and 5v to the existing 10 pin and 22 pin are often wired together, you just have to connect the ground and 3.3 v line from the other wires (splice)


    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

  6. #6
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    Re: Dell Precision 690 1000W PSU to MATX board?

    Quote Originally Posted by TheGlasMan View Post
    I would think you would have a 24 pin connectors as 20 pins are obsolete (well at least OLD).

    If the Dell wires have different colors then use a Volt Ohm Meter (20 bucks) to determine the voltages of each color.

    The only difference between the 20 pin connector and the 24 pin is the 11, 12, 23,and 24 pins. The extra pin slots 12v and 5v to the existing 10 pin and 22 pin are often wired together, you just have to connect the ground and 3.3 v line from the other wires (splice)
    How do u remove the psu connector pins with a screw driver?

    Anyway I do need to re-assign wires to pins by pulling the pins rather than nightmarish soldering.

    I ran the 12v rails from the P2 20-pin to the P1 24-pin's 12v rails and did the same to all others. It didn't like that for some reason? It would power up for a split second and turn off. Unplug the 20-pin and it worked okay of the 24-pin alone.

    Do we think I could get a bunch of stability off the P1 24-pin alone?

    Doesn't the yellow wire on a power supply signal a +12v rail?

    Since there's two on the 24-pin and three on the 20-pin...?

  7. #7
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    Re: Dell Precision 690 1000W PSU to MATX board?

    How do u remove the psu connector pins with a screw driver?
    You do not move any pins (if standard 20 pin) Screw driver (there is a special tool) must be narrow enough to slice in. It will release the prongs that hold the pin in, but you should not have to do this as the 5v and 12v should already be wired (connected in the socket, LOOK inside the 24 pin socket) . The 3.3 (12)and ground (24) (if needed by board at all) should be spliced in with new pins.



    Anyway I do need to re-assign wires to pins by pulling the pins rather than nightmarish soldering.
    Yes, but you may have to spice into a 3.3volt for pin 12 and pin 24 ground. The 5 and 12 volt lines should be wired together with pins 10 and 22

    I ran the 12v rails from the P2 20-pin to the P1 24-pin's 12v rails and did the same to all others. It didn't like that for some reason? It would power up for a split second and turn off. Unplug the 20-pin and it worked okay of the 24-pin alone.
    NO, pin20 (pin 22 on 24 pin connector) is 5v, pin2 is 3.3v on both connectors. Are you looking at connectors upside down?

    Do we think I could get a bunch of stability off the P1 24-pin alone?
    Yes, minus the bunch


    Doesn't the yellow wire on a power supply signal a +12v rail?
    Standard yes, but you have a propriety PSU and I can't say. You must check with V-O meter if unsure

    Since there's two on the 24-pin and three on the 20-pin...?
    ??? I don't understand this. Think you are not finding #1 pin correctly


    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

  8. #8
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    Re: Dell Precision 690 1000W PSU to MATX board?

    Ok i decided to not run P1 and P2 together since it doesn't like doing that at all.

    This power supply has 2 board connections, a P1 24-pin and a P2 20-pin which connect to the board. The P2 20-pin contains a whole bunch of grounds, 3 additional +12v yellows etc. I'd like to atleast run the 3 yellows on P2 to P1 to get more 12v power if that's possible?





    I'm a little worried about the 8-pin... Advice?





    I cut off a bad PSU 24-pin to wire into the P1 only on the precision 690 power supply.

    The precision 690 24-pin is missing 2 pins, if counting pin #1 with secure clip facing up. Pin #1 top left is missing on the 24-pin precision 690 power supply. Pin #21 bottom right is missing as well. Those pin identify as +3.3v and +5v-sby. What should i do about the connector missing the pins?

    Standard ATX 24-PIN



    Dell Precision 690 P1 24-PIN

    Last edited by chris89; 06-08-2014 at 04:16 PM.

  9. #9
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    Re: Dell Precision 690 1000W PSU to MATX board?

    A bit of progress. There were 6 grounds on the P1 Dell 24-pin, and there were 8 grounds on the standard atx 24-pin. I spliced them together...


  10. #10
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    Re: Dell Precision 690 1000W PSU to MATX board?

    Ran into an issue, cannot use -5v because there is no -5v white wire on the dell 690 24-pin...

    Maybe this is the time to splice from the P2 20-pin where the white wires exist...

  11. #11
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    Re: Dell Precision 690 1000W PSU to MATX board?

    Well looks like I did it!!!!

    Tested it and booted the system no issue. Very powerful power supply. Idle in bios shows 13.75v which is typical epicness of server power supplies.

    Anyway only running 2 of 5 rails into the 24-pin which is 36A rated, if I run into stability issues I'll splice the 3 additional 18A rails into the 24-pin but I doubt it'll require that.

    Anyway if anyone wants a $50 1,000 watt power supply with FIVE 18A rails totaling to 90 Amps and maximal peak of 1,100 watts.... Go for the Precision 690 1000 watt. It's super cheap on ebay just gonna need to do the harness or hell I'll make them for a fee.



    Thanks

  12. #12
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    Re: Dell Precision 690 1000W PSU to MATX board?

    Congrats!!!

    Thanks for the pics, sure is crazy looking! Never seen a board with 20 pin and 24 pin before

    The other rails are for gpu and peripherals, let the 8 pin hang.

    I would take the insulation off the crimps and solder the connection then tape for insulation. Over time crimps can come loose.


    "The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
    - Albert Einstein (1879-1955)

  13. #13
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    Re: Dell Precision 690 1000W PSU to MATX board?

    Quote Originally Posted by TheGlasMan View Post
    Congrats!!!

    Thanks for the pics, sure is crazy looking! Never seen a board with 20 pin and 24 pin before

    The other rails are for gpu and peripherals, let the 8 pin hang.

    I would take the insulation off the crimps and solder the connection then tape for insulation. Over time crimps can come loose.
    Thanks for the advice!

    Yeah all connections have been soldered meticulously for maximum electrical performance.

    I've done quite a bit more modding since I'm working on stabilizing 12v droop. 3.3v is report 3.248v which i feel is okay. 5v reports 5.045v which is great and 12v is reporting consistently 12.056v even under heavy gtx 470 load.

    What I am seeing is some fairly decent droop on the 12v rail when the i7 is under load.

    Which I have traced to lack of AWG and excessive length on the 20pin/24pin to 24pin wire harness and the 4-pin EPS connector.

    So I'm going to re-do the EPS 8 pin with a 14 AWG 4+4pin EPS and make it as short as possible to completely eliminate droop under cpu load.

    I even threw 3 GTX 470's at it and the 12v reported absolutely ZERO droop what so ever.

    This power supply is by far the most powerful/ cool/ and stable power supply I have ever tested.

    That includes $200-$500 1,000+ Watt power supplies from major brands.

    Making this power supply the best deal ever!! it's super heavy and super durable. Requires this giant 2 AWG power cord specially for this power supply.

    More pics and updates coming soon...


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