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    A little question on powered riser by a french noobie

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    • K
      kliou last edited by

      Hello,

      I’m a french noobie in mining.

      I have buy :

      Enermax Platimax EPM1500EGT
      ASRock 970 EXTREME4
      5 * 7950 Vapor X
      2gb ram
      Amd sempron 145

      And 3 PCI 16 X 16 X Unpowered Risers.

      This config will run with 2 supplements powered risers 1x 16x or I need to have 5 powered risers ?

      Thanks you very much,
      Best regards

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      • K
        kojima18 last edited by

        Hi Kliou,

        Quick pointers, I would recommend at least 4gb of ram… maybe even 8 gb if you want to run 5.

        I think windows might have some problems with 5 GPU (I could be wrong), you might have to run Linux.

        Risers its fine to have 2 powered x1 and 3 unpowered for the x16.

        Beside that your PSU is fine, I have 3 of them and they run beautifully.

        Enjoy and Goodluck

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        • S
          s2 bergen last edited by

          Let me know if you have added extra rams. I have x3 r9 now connected, but in few days my risers will arrive and I add 2 more GPU’S. And I also have 4gb rams atm.

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          • A
            angloblaxon Regular Member last edited by

            windows 8 supports 6 if im not mistaken. linux supports 8. windows 7 supports 4

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            • A
              angloblaxon Regular Member last edited by

              [quote name=“kojima18” post=“42701” timestamp=“1386708930”]
              Hi Kliou,

              Quick pointers, I would recommend at least 4gb of ram… maybe even 8 gb if you want to run 5.

              I think windows might have some problems with 5 GPU (I could be wrong), you might have to run Linux.

              Risers its fine to have 2 powered x1 and 3 unpowered for the x16.

              Beside that your PSU is fine, I have 3 of them and they run beautifully.

              Enjoy and Goodluck
              [/quote]

              How long have you run this PSU? can you switch it to 1 rail instead of the multi?

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              • S
                svennand Regular Member last edited by

                if you had read the sticky on top of the mining section about powered risers. you wouldnt need to ask this question

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                • K
                  kliou last edited by

                  [quote name=“kojima18” post=“42701” timestamp=“1386708930”]
                  Hi Kliou,

                  Quick pointers, I would recommend at least 4gb of ram… maybe even 8 gb if you want to run 5.

                  I think windows might have some problems with 5 GPU (I could be wrong), you might have to run Linux.

                  Risers its fine to have 2 powered x1 and 3 unpowered for the x16.

                  Beside that your PSU is fine, I have 3 of them and they run beautifully.

                  Enjoy and Goodluck
                  [/quote]

                  Thanks for your answer. Yes, I will use linux.
                  For the ram, are you sure? I readed this [url=http://www.cryptobadger.com/2013/04/build-a-litecoin-mining-rig-faq/#memory]http://www.cryptobadger.com/2013/04/build-a-litecoin-mining-rig-faq/#memory[/url] and they say the contrary
                  "Don’t I need more than 4GB of RAM? I read other guides that say I need 1.5GB per GPU, minimum.

                  Cgminer uses the memory on your GPUs, so you don’t need much system memory at all. You can get by just fine with 1-2GB of RAM in Linux, and 4GB is plenty in Windows.

                  If you read other guides telling you that you need a ton of system RAM, the author was probably running Reaper as their mining software, which oddly uses system memory."

                  [quote author=svennand link=topic=5737.msg42719#msg42719 date=1386710720]
                  if you had read the sticky on top of the mining section about powered risers. you wouldnt need to ask this question
                  [/quote]

                  svennand I know this is a common question but I search a lot on the net and read but some persons use only powered risers. So I doesn’t understand. I have read this : : [url=http://forum.feathercoin.com/index.php/topic,2193.msg17347.html#msg17347]http://forum.feathercoin.com/index.php/topic,2193.msg17347.html#msg17347[/url] and [url=http://www.cryptobadger.com/2013/04/build-a-litecoin-mining-rig-faq/#more_GPUs]http://www.cryptobadger.com/2013/04/build-a-litecoin-mining-rig-faq/#more_GPUs[/url] but it’s too ambigue for me, my comprehension in english is limited.

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                  • S
                    svennand Regular Member last edited by

                    Quote from nutnuts post:

                    Standard Shop bought Riser. These simply solder a molex connector to the power lines of the riser which you then connect a spare 4pin molex to and voila! You are no longer dragging all that current through the slot on the motherboard right? Wrong! The issue is that there is still a connection back to the motherboard so the other cards in the system can pull the power back through slot and through the motherboard traces again. It will help save the 24pin connector and will reduce the mobo load as at least one card will get it’s power directly from the PSU but now you’re pulling crazy currents through the ribbon cable of the riser too. [b]Not an issue if you are using ALL powered risers but if you are only intending on 1 or 2 then it is an issue[/b]. The final thing is that the shop bought powered riser that i saw only had the power soldered to 1 pin so that connection to the card is dishing up all the juice and may be another bottleneck.

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                    • S
                      svennand Regular Member last edited by

                      If you use the backfeed version of powered risers, it can be an issue.
                      If not. then no its not an issue.

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                      • K
                        kojima18 last edited by

                        How about skipping powered risers and using this MB instead :D

                        [url=http://www.asrock.com/mb/Intel/H81%20Pro%20BTC/]http://www.asrock.com/mb/Intel/H81 Pro BTC/[/url]

                        2 extra 4 pin power connectors, Gain Extra mining power!

                        [img]http://www.asrock.com/mb/sticker/8-Bitcoin-H81 Pro BTC.jpg[/img]

                        When its being release is another story… and how much as well

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                        • A
                          angloblaxon Regular Member last edited by

                          lol. that motherboard shows up again!

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