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    [Guide] Homebrew powered risers.

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    • M
      Max.Wyght last edited by

      [s]nutnut, will you update your guide with how to add eathing to the risers?[/s]

      edit:
      So after my serious brain fart and meltdown, I figured out the right sentence structure;
      Nutnut, will you be updating your guide with how to add grounding to the home-made risers?

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      • S
        sheepson Regular Member last edited by

        I’ve order some ‘normal’ risers so i am going to read this topic carefully soon!

        Added the guide to:
        [url=http://forum.feathercoin.com/index.php/topic,685]http://forum.feathercoin.com/index.php/topic,685[/url]

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        • wrapper
          wrapper Moderators last edited by

          Any chance this could be compressed into one page, I’ll edit into the pinned guide in mining, if required?

          I found it confusing what was decided safe at the end. Possibly room for someone to do a Youtube / Blue Peter “video how to”.

          I just use a riser, but I like to see steam punk solutions.

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          • L
            lbr last edited by

            Anyone has any objections to the following -

            Ideal riser should be

            0*) PCIEx16 -> PCIEx1, cause mining does not require bandwidth and x1 link theoretically puts lower strain on the mg chipset/CPU.
            Tho some motherboards will require presence shorting if x1 risers are used in x16 slots.

            1. “cut” - to prevent current flow from/to motherboard voltage regulatorsPSU and to enable use of multiple PSUs

            2. have thick enough wires on +12v lines, so they won’t burn, but not thick enough to cause significant voltage drop

            3. all +12v lines shorted on the riser - to not overcurrent one pin only

            4. wires soldered directly to slot

            5*) +5v/+3v lines also going to PSU --> “ideally”

            1. capacitors on +12vground, closer to load - better, HF fast capacitors, tantalum(?), solid(?), rating(?)

            2. ground line also soldered and connected to PSU

            Ideal multi-PSU

            1. different PSUs +12v rails separated from each other
            2. different PSUs +5/+3 rails separated from each other
              3*) same PSU rails not mixing with each other
            3. Properly synced - aka turning on/off at the same time

            * does not really matter or not in the scope of the subject

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            • ghostlander
              ghostlander Regular Member last edited by

              [quote]6) capacitors on +12vground, closer to load - better, HF fast capacitors, tantalum(?), solid(?), rating(?)[/quote]

              As for solid electrolytes, you want some radial ones probably. Nippon Chemi-Con PSC 270uF/16V (diameter 8mm) are a good choice. PSA or PS are older models with a little bit higher ESR. If you can get and fit Nippon PSC 470uF/16V (diameter 10mm), that’s even better. Sanyo solid electrolytes are more expensive usually unless you’re salvaging them from broken equipment.

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              • L
                lbr last edited by

                [quote name=“ghostlander” post=“47275” timestamp=“1387875839”]
                [quote]6) capacitors on +12vground, closer to load - better, HF fast capacitors, tantalum(?), solid(?), rating(?)[/quote]

                As for solid electrolytes, you want some radial ones probably. Nippon Chemi-Con PSC 270uF/16V (diameter 8mm) are a good choice. PSA or PS are older models with a little bit higher ESR. If you can get and fit Nippon PSC 470uF/16V (diameter 10mm), that’s even better. Sanyo solid electrolytes are more expensive usually unless you’re salvaging them from broken equipment.
                [/quote]

                Thanks, I have a batch of Sanyo OS-CON, will use them.

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                • M
                  mirrax last edited by

                  [quote name=“wrapper0feather” post=“45855” timestamp=“1387380800”]
                  Any chance this could be compressed into one page, I’ll edit into the pinned guide in mining, if required?

                  I found it confusing what was decided safe at the end. Possibly room for someone to do a Youtube / Blue Peter “video how to”.

                  I just use a riser, but I like to see steam punk solutions.
                  [/quote]
                  +1
                  Do this, this, this, end.
                  No opinions :)

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                  • L
                    lbr last edited by

                    [url=http://www.kitguru.net/components/power-supplies/zardon/silverstone-strider-gold-1200w-psu-review-sst-st1200-g/2/]http://www.kitguru.net/components/power-supplies/zardon/silverstone-strider-gold-1200w-psu-review-sst-st1200-g/2/[/url]
                    [img]http://www.kitguru.net/wp-content/uploads/2011/06/cables.png[/img]

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                    • J
                      jti8899 last edited by

                      nutnut, rep for the post as it saved me a bunch of$$ on risers and I believe will end me with a better quality rig.

                      Suggestion for the next info post would be wiring of dual PS on a 4 card rig.

                      Thanks again
                      ~//~

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                      • J
                        jewfromdahood Banned last edited by

                        I’m curious do I still need to cut the cables to remove it from going back to the board. Because I plan on being able to have 7 AMD R9 280x GPU’s in one rig. 5 x PCI-E X16 powered riser and 2 x PCI-E X1 --> PCI-E X16 powered riser
                        Basically they are these ones [url=http://www.moddiy.com/products/PCI%252dExpress-PCI%252dE-1X-to-16X-Riser-Ribbon-Extender-Cable-w%7B47%7DMolex-%252b-Solid-Capacitor-%2830cm%29.html]http://www.moddiy.com/products/PCI%252dExpress-PCI%252dE-1X-to-16X-Riser-Ribbon-Extender-Cable-w{47}Molex-%252b-Solid-Capacitor-(30cm).html[/url] and their PCI-E X16 --> PCI-E X16 equivalent as well… Do I need to do any modifications to keep it from frying my board or no?
                        Also I have planned on two Silverstone Zeus 1,350 Watt PSUs for my rig how should I connect them all? Can I use one PSU for say the motherboard, HD, and such plus 3 GPU’s and their powered Risers and the other PSU to the other 4 GPU’s and their powered risers?

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