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Title: 6990 rig setup help (b) Post by: Sjalq on June 03, 2011, 07:33:22 PM I have a 1200W CoolerMaster gold. This thing emits enough power to run support hardware and 3x6990s (Club 3Ds). Problem is the cables do not match with the graphics hardware PCI-e connectors. The PSU has 4xPCI-e 6+2 connectors and 2xPCI-e 6 connectors. The cards have 2xPCI-e 6+2 connectors each. So now I can power 2 cards, but not the 3rd one...
Does anyone know whether the cards can run on one PCI-e 6+2 connector and one PCI-e 6 connector like normal cards seem to? Title: Re: 6990 rig setup help (b) Post by: kloinko1n on June 04, 2011, 10:01:30 AM This thing emits enough power to run support hardware and 3x6990s (Club 3Ds). I dare to disagree with you on that. Or, at least I have some serious doubts. Title: Re: 6990 rig setup help (b) Post by: allinvain on June 04, 2011, 10:07:28 AM Use a molex to 8 pin adapter or a 8 pin to 6 pin converter and a molex to 8 pin..
Title: Re: 6990 rig setup help (b) Post by: NetTecture on June 04, 2011, 10:10:33 AM This thing emits enough power to run support hardware and 3x6990s (Club 3Ds). I dare to disagree with you on that. Or, at least I have some serious doubts. He does what I do.... try to mimic the 3x6990 setup from https://en.bitcoin.it/wiki/Mining_rig#Three_ATI_6990s,_Approximately_2.1_Ghash/s It says 1200w ;) And 3x6990 ;) Title: Re: 6990 rig setup help (b) Post by: Maxxx on June 04, 2011, 10:26:52 AM This thing emits enough power to run support hardware and 3x6990s (Club 3Ds). I dare to disagree with you on that. Or, at least I have some serious doubts. He does what I do.... try to mimic the 3x6990 setup from https://en.bitcoin.it/wiki/Mining_rig#Three_ATI_6990s,_Approximately_2.1_Ghash/s It says 1200w ;) And 3x6990 ;) Have you got yours running yet or still ordering? Title: Re: 6990 rig setup help (b) Post by: NetTecture on June 04, 2011, 10:46:49 AM This thing emits enough power to run support hardware and 3x6990s (Club 3Ds). I dare to disagree with you on that. Or, at least I have some serious doubts. He does what I do.... try to mimic the 3x6990 setup from https://en.bitcoin.it/wiki/Mining_rig#Three_ATI_6990s,_Approximately_2.1_Ghash/s It says 1200w ;) And 3x6990 ;) Have you got yours running yet or still ordering? Currently getting quotes and asking wild here - if I get the stuff sorted out, I would order next week, put it in poduction after the following weekend (because I bet some parts do not arrive till end of the week). Would be 1 of x ;) Title: Re: 6990 rig setup help (b) Post by: Sjalq on June 04, 2011, 09:13:18 PM Well I am learning a lot. Feels like I'm 14 again :D
I also have my doubts if the power supply will supply a 3rd card now, but we'll test and see, maybe have them all under-perform until we can source more juice. Great fun this mining business! Title: Re: 6990 rig setup help (b) Post by: NetTecture on June 04, 2011, 09:22:43 PM Actually it should. Going through some other posts it looks like people get the cards down quite a lot pwoer wise by selectively tuning the frequencies.
Moving memory to 300mhz seems to be recommended with people saying cards run around 65 degree centigradem, and IIRC i read somewhere someone said fans at 30% ;) - this indicates the card may run hot on a point (the processors) but memory and shader units are not busy at all... which makes sense ;) Title: Re: 6990 rig setup help (b) Post by: bcpokey on June 04, 2011, 09:34:43 PM Even without downclocking memory a 1200W is enough to power 3x 6990s, though it is pushing the envelope a little bit. 6990s use ~375Watts per card (300 from 2x 8pin and 75 from PCI-E slot). That's 1125Watts max to be within ATX specifications. In reality they pull less but anyway I digress.
To power 3 6990s you will have to get an 8-pin adapter cable. 8Pin PCIE cables supply 150Watts, 6Pin 75, so do not simply try to plug a 6 pin into the 8pin socket. There are 2 extra ground cables iirc in the 8pin. |