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    • C
      ChristianRiesen Regular Member last edited by

      [quote name=“pyxis” post=“4295” timestamp=“1368872584”]
      Card 1 7950 615Khash 54°C
      Card 2 7950 615Khash 69°C
      Card 3 7950 615Khash 69°C
      Card 4 7950 615Khash 69°C
      (No overclocking, All 4 cards cooled with a single 150mm 20Watt Fan, Speed Average over 1 week)

      (In Overclocking tests I can get cards up over 700Khash each, but I have done no long duration runs)
      [/quote]
      Can you post your parameters for those 700 Khash speeds? Like the command used to start cgminer with the correct settings to reach that. I haven’t gone all the way out, I reach about 650 steady at 73C .

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      • S
        sheepson Regular Member last edited by

        My machine just crashed! :(.

        I can’t reboot it till tuesday.

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          pyxis last edited by

          [quote name=“ChristianRiesen” post=“4303” timestamp=“1368877904”]
          [quote author=pyxis link=topic=264.msg4295#msg4295 date=1368872584]
          Card 1 7950 615Khash 54°C
          Card 2 7950 615Khash 69°C
          Card 3 7950 615Khash 69°C
          Card 4 7950 615Khash 69°C
          (No overclocking, All 4 cards cooled with a single 150mm 20Watt Fan, Speed Average over 1 week)

          (In Overclocking tests I can get cards up over 700Khash each, but I have done no long duration runs)
          [/quote]
          Can you post your parameters for those 700 Khash speeds? Like the command used to start cgminer with the correct settings to reach that. I haven’t gone all the way out, I reach about 650 steady at 73C .
          [/quote]

          I use GUIMiner and MSI afterburner, afterburner settings are power limit at 20%, core clock at around 1200Mhz and memory clock at 1400Mhz max, I have had a constant 710Khash but I ran it only for 1 hour as I had no cooling. I have not yet carried out longer tests so I don’t know if 700plus speeds can be maintained very long.

          Hope this helps, hope I don’t blow up my rig :) All in the name of science, fun and coins. ;D

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          • K
            Kagemusha last edited by

            4870 @ 100kh/s (retired until I can x-fire it with another 4870)
            6950 (unlocked to 6970) @ 240kh/s (needs work to optimise) currently getting CGminer crashes at 13 intensity…

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            • C
              ChristianRiesen Regular Member last edited by

              [quote name=“Kagemusha” post=“4352” timestamp=“1368908808”]
              4870 @ 100kh/s (retired until I can x-fire it with another 4870)
              6950 (unlocked to 6970) @ 240kh/s (needs work to optimise) currently getting CGminer crashes at 13 intensity…
              [/quote]
              Just as a hint, crossfire does nothing to improve hashrates, in fact it can even lower them.

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              • K
                Kagemusha last edited by

                [quote name=“ChristianRiesen” post=“4353” timestamp=“1368909118”]
                [quote author=Kagemusha link=topic=264.msg4352#msg4352 date=1368908808]
                4870 @ 100kh/s (retired until I can x-fire it with another 4870)
                6950 (unlocked to 6970) @ 240kh/s (needs work to optimise) currently getting CGminer crashes at 13 intensity…
                [/quote]
                Just as a hint, crossfire does nothing to improve hashrates, in fact it can even lower them.
                [/quote]

                Gah! More reading it is then…ta.

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                • P
                  pyxis last edited by

                  Added another 200Khash in overclocking ;D and with only a few degrees heat increase. See post above for new stats.

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                  • C
                    ChristianRiesen Regular Member last edited by

                    [quote name=“pyxis” post=“4422” timestamp=“1368982167”]
                    Added another 200Khash in overclocking ;D and with only a few degrees heat increase. See post above for new stats.
                    [/quote]
                    Thats some cool numbers.

                    As a hint when doing ducting with fans: You can make it worse with ducts. I suggest using cardboard or similar material that you can fast move and alter for first trials while keeping your temperatures in constant view. If you do it wrong, you might actually deflect your fans power from where it needs to be.

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                      pyxis last edited by

                      Thank You Christian.

                      Excellent, I have corrugated plastic board which is similar to cardboard but stronger.
                      I can use that for testing.
                      Once I get the size and shape correct, I can make a metal duct.

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                      • C
                        ChristianRiesen Regular Member last edited by

                        [quote name=“pyxis” post=“4444” timestamp=“1368995869”]
                        Thank You Christian.

                        Excellent, I have corrugated plastic board which is similar to cardboard but stronger.
                        I can use that for testing.
                        Once I get the size and shape correct, I can make a metal duct.
                        [/quote]
                        Be careful with the plastic, it might melt… Cardboard can catch fire, but usually takes a bit more than the plastic melting point :)

                        A good begin is to get directly form the fan to where the cards start. Close holes on the sides, etc, then the air should get much more direct on target.

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                        • N
                          Nutnut Regular Member last edited by

                          Still cant help but think you’re over thinking the cooling/ducting. I have 3x 12" desk fans that cool all 5 of my rigs. Current temps on Miner-01 65,63,66,70. KISS (Keep It Simple Sir).

                          Oh and if you manage to set fire to cardboard on your GPU’s - you’re doing something very wrong. :P

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                          • D
                            DeadZebra Regular Member last edited by

                            Rig stats updated :P Please let me know if you think I’ve missed something.

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                            • N
                              Nutnut Regular Member last edited by

                              Top Man!

                              The Sapphire stats aren’t mine though. :-\

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                              • D
                                DeadZebra Regular Member last edited by

                                [quote name=“Nutnut” post=“4837” timestamp=“1369120058”]
                                Top Man!

                                The Sapphire stats aren’t mine though. :-\
                                [/quote]

                                Woops haha let me fix that

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                                • D
                                  DeadZebra Regular Member last edited by

                                  Two cards were replaced.

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                                  • D
                                    Drjones Regular Member last edited by

                                    I have 3 x 7950’s temps are abit weird.

                                    Temps are - 59, 69 and 89

                                    Seems which ever one i use in slot one cant keep it under 89? I have to run this @ only 460 k/hash while other are on 600 k/hash with no problems.

                                    Pics included below:

                                    [img]http://s22.postimg.org/6e43whmox/IMG_0493.jpg[/img]
                                    [img]http://s17.postimg.org/ufzmpt333/IMG_0494.jpg[/img]

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                                      Nutnut Regular Member last edited by

                                      Slot 1 being the slot closest to the CPU or the one balancing on the soup (one way to warm your lunch!).

                                      If it’s the CPU side (though the pictures imply that you are calling the soup card slot 1) then that’s normal for the gigabyte windforce as the fans suck in the hot air from the back of the card in front - great cards but awful cooling design!

                                      If you mean the “soup card” and your sure all 3 behave the same then there is a serious issue there. Are you using afterburner or something like that to OC? Maybe it’s screwing with your fan speeds and preventing them from spinning up? What does CGMiner say about the fan speeds?

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                                        Drjones Regular Member last edited by

                                        Lol ran out of beans ;)

                                        The one cloest to cpu is the problem thinking of using a riser cable on it to see if makes a difference getting it away. As there are 2 cards close togther and if they suck air rather than blow could be the problem?

                                        Use afterburner only thing changed is fan speed 100% all other settings are stock as unsure of oc settings. If i leave on autofan speed computer is i in ide state in morning and team viwer unable to connect and have to reset.

                                        No sure about cgminer use gpuminer with intencity @ 18 on 2 cards getting 600k/ hash and 14 on high temp geting around 460 ish. Shame can get that third one bit faster

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                                        • D
                                          Drjones Regular Member last edited by

                                          On the back of the 2 cards on the mb where you have the card outputs i have a pc fan blowing into there should i have that the other way around if the fans on the card are pushing the hot air into the colder air coming out of the fan?

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                                          • K
                                            kevmif last edited by

                                            2x5850’s using cgminer with the standard scrypt config. Nothing special. Both cards OC’d a little. Getting around 650Kh/s combined but I am solo mining.

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